13909929 has 16 divisors (see below), whose sum is σ = 20398080. Its totient is φ = 8361360.

The previous prime is 13909921. The next prime is 13909939. The reversal of 13909929 is 92990931.

It is a happy number.

It is not a de Polignac number, because 13909929 - 2³ = 13909921 is a prime.

It is a super-2 number, since 2×13909929² = 386972249570082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13909921) 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, 2532 + ... + 5850.

It is an arithmetic number, because the mean of its divisors is an integer number (1274880).

Almost surely, 2^13909929 is an apocalyptic number.

It is an amenable number.

13909929 is a deficient number, since it is larger than the sum of its proper divisors (6488151).

13909929 is a wasteful number, since it uses less digits than its factorization.

13909929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 13909929 is about 3729.6017213638. The cubic root of 13909929 is about 240.4962475084.

It can be divided in two parts, 139099 and 29, that added together give a triangular number (139128 = T₅₂₇).

The spelling of 13909929 in words is "thirteen million, nine hundred nine thousand, nine hundred twenty-nine".