13649881 has 12 divisors (see below), whose sum is σ = 16219008. Its totient is φ = 11449032.

The previous prime is 13649863. The next prime is 13649887. The reversal of 13649881 is 18894631.

13649881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13649881 - 2⁵ = 13649849 is a prime.

It is a super-2 number, since 2×13649881² = 372638502628322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13649887) 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, 661 + ... + 5266.

It is an arithmetic number, because the mean of its divisors is an integer number (1351584).

Almost surely, 2^13649881 is an apocalyptic number.

It is an amenable number.

13649881 is a deficient number, since it is larger than the sum of its proper divisors (2569127).

13649881 is an equidigital number, since it uses as much as digits as its factorization.

13649881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5988 (or 5981 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 13649881 is about 3694.5745357213. The cubic root of 13649881 is about 238.9881065258.

The spelling of 13649881 in words is "thirteen million, six hundred forty-nine thousand, eight hundred eighty-one".