13538240 has 28 divisors (see below), whose sum is σ = 32238696. Its totient is φ = 5415168.

The previous prime is 13538233. The next prime is 13538269. The reversal of 13538240 is 4283531.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20834 + ... + 21473.

It is an arithmetic number, because the mean of its divisors is an integer number (1151382).

Almost surely, 2^13538240 is an apocalyptic number.

13538240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13538240 is an abundant number, since it is smaller than the sum of its proper divisors (18700456).

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

13538240 is an equidigital number, since it uses as much as digits as its factorization.

13538240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42324 (or 42314 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 13538240 is about 3679.4347391957. The cubic root of 13538240 is about 238.3347688744.

The spelling of 13538240 in words is "thirteen million, five hundred thirty-eight thousand, two hundred forty".