13639881 has 8 divisors (see below), whose sum is σ = 18442944. Its totient is φ = 8965040.

The previous prime is 13639867. The next prime is 13639919. The reversal of 13639881 is 18893631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13639881 - 2¹³ = 13631689 is a prime.

It is a super-2 number, since 2×13639881² = 372092707388322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13639811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31806 + ... + 32231.

It is an arithmetic number, because the mean of its divisors is an integer number (2305368).

Almost surely, 2^13639881 is an apocalyptic number.

It is an amenable number.

13639881 is a deficient number, since it is larger than the sum of its proper divisors (4803063).

13639881 is an equidigital number, since it uses as much as digits as its factorization.

13639881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64111.

The product of its digits is 31104, while the sum is 39.

The square root of 13639881 is about 3693.2209519605. The cubic root of 13639881 is about 238.9297308052.

The spelling of 13639881 in words is "thirteen million, six hundred thirty-nine thousand, eight hundred eighty-one".