13391620 has 48 divisors (see below), whose sum is σ = 31752000. Its totient is φ = 4699520.

The previous prime is 13391551. The next prime is 13391621. The reversal of 13391620 is 2619331.

It is not an unprimeable number, because it can be changed into a prime (13391621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5331 + ... + 7429.

It is an arithmetic number, because the mean of its divisors is an integer number (661500).

Almost surely, 2^13391620 is an apocalyptic number.

13391620 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 13391620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15876000).

13391620 is an abundant number, since it is smaller than the sum of its proper divisors (18360380).

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

13391620 is a wasteful number, since it uses less digits than its factorization.

13391620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148 (or 2146 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 13391620 is about 3659.4562437608. The cubic root of 13391620 is about 237.4712504443.

The spelling of 13391620 in words is "thirteen million, three hundred ninety-one thousand, six hundred twenty".