13438840 has 32 divisors (see below), whose sum is σ = 32017680. Its totient is φ = 5059072.

The previous prime is 13438811. The next prime is 13438853. The reversal of 13438840 is 4883431.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9202 + ... + 10561.

Almost surely, 2^13438840 is an apocalyptic number.

13438840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13438840 is an abundant number, since it is smaller than the sum of its proper divisors (18578840).

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

13438840 is a wasteful number, since it uses less digits than its factorization.

13438840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19791 (or 19787 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 13438840 is about 3665.9023445804. The cubic root of 13438840 is about 237.7500376861.

The spelling of 13438840 in words is "thirteen million, four hundred thirty-eight thousand, eight hundred forty".