13421520 has 120 divisors (see below), whose sum is σ = 51532416. Its totient is φ = 3066624.

The previous prime is 13421509. The next prime is 13421521. The reversal of 13421520 is 2512431.

13421520 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×13421520² = 360274398220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

13421520 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 13421493 and 13421502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3709 + ... + 6371.

Almost surely, 2^13421520 is an apocalyptic number.

13421520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25766208).

13421520 is an abundant number, since it is smaller than the sum of its proper divisors (38110896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13421520 is a wasteful number, since it uses less digits than its factorization.

13421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689 (or 2680 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13421520 is about 3663.5392723431. The cubic root of 13421520 is about 237.6478562244.

Adding to 13421520 its reverse (2512431), we get a palindrome (15933951).

The spelling of 13421520 in words is "thirteen million, four hundred twenty-one thousand, five hundred twenty".