13239681 has 16 divisors (see below), whose sum is σ = 21727104. Its totient is φ = 6983424.

The previous prime is 13239671. The next prime is 13239691. The reversal of 13239681 is 18693231.

It is an interprime number because it is at equal distance from previous prime (13239671) and next prime (13239691).

It is not a de Polignac number, because 13239681 - 2⁵ = 13239649 is a prime.

It is a super-2 number, since 2×13239681² = 350578305963522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13239641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23976 + ... + 24521.

It is an arithmetic number, because the mean of its divisors is an integer number (1357944).

Almost surely, 2^13239681 is an apocalyptic number.

It is an amenable number.

13239681 is a deficient number, since it is larger than the sum of its proper divisors (8487423).

13239681 is a wasteful number, since it uses less digits than its factorization.

13239681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48520.

The product of its digits is 7776, while the sum is 33.

The square root of 13239681 is about 3638.6372449036. The cubic root of 13239681 is about 236.5697297469.

The spelling of 13239681 in words is "thirteen million, two hundred thirty-nine thousand, six hundred eighty-one".