13709538 has 24 divisors (see below), whose sum is σ = 30002076. Its totient is φ = 4524000.

The previous prime is 13709513. The next prime is 13709551. The reversal of 13709538 is 83590731.

It can be written as a sum of positive squares in 2 ways, for example, as 13638249 + 71289 = 3693^2 + 267^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1953 + ... + 5588.

Almost surely, 2^13709538 is an apocalyptic number.

13709538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13709538 is an abundant number, since it is smaller than the sum of its proper divisors (16292538).

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

13709538 is a wasteful number, since it uses less digits than its factorization.

13709538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7650 (or 7647 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 13709538 is about 3702.6393289112. The cubic root of 13709538 is about 239.3357675093.

The spelling of 13709538 in words is "thirteen million, seven hundred nine thousand, five hundred thirty-eight".