13809438 has 24 divisors (see below), whose sum is σ = 30003168. Its totient is φ = 4590432.

The previous prime is 13809431. The next prime is 13809443. The reversal of 13809438 is 83490831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7506 + ... + 9162.

It is an arithmetic number, because the mean of its divisors is an integer number (1250132).

Almost surely, 2^13809438 is an apocalyptic number.

13809438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13809438 is an abundant number, since it is smaller than the sum of its proper divisors (16193730).

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

13809438 is a wasteful number, since it uses less digits than its factorization.

13809438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 13809438 is about 3716.1052191777. The cubic root of 13809438 is about 239.9156995594.

The spelling of 13809438 in words is "thirteen million, eight hundred nine thousand, four hundred thirty-eight".