13402240 has 64 divisors (see below), whose sum is σ = 32852160. Its totient is φ = 5225472.

The previous prime is 13402237. The next prime is 13402247. The reversal of 13402240 is 4220431.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (13402247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27277 + ... + 27763.

It is an arithmetic number, because the mean of its divisors is an integer number (513315).

Almost surely, 2^13402240 is an apocalyptic number.

13402240 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 13402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16426080).

13402240 is an abundant number, since it is smaller than the sum of its proper divisors (19449920).

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

13402240 is an equidigital number, since it uses as much as digits as its factorization.

13402240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 13402240 is about 3660.9069914435. The cubic root of 13402240 is about 237.5340080571.

Adding to 13402240 its reverse (4220431), we get a palindrome (17622671).

The spelling of 13402240 in words is "thirteen million, four hundred two thousand, two hundred forty".