13929531 has 32 divisors (see below), whose sum is σ = 23666688. Its totient is φ = 7076640.

The previous prime is 13929529. The next prime is 13929547. The reversal of 13929531 is 13592931.

13929531 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 13929531 - 2¹ = 13929529 is a prime.

It is a super-2 number, since 2×13929531² = 388063667759922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 13929492 and 13929501.

It is not an unprimeable number, because it can be changed into a prime (13929551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10216 + ... + 11498.

It is an arithmetic number, because the mean of its divisors is an integer number (739584).

Almost surely, 2^13929531 is an apocalyptic number.

13929531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13929531 is a deficient number, since it is larger than the sum of its proper divisors (9737157).

13929531 is a wasteful number, since it uses less digits than its factorization.

13929531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its digits is 7290, while the sum is 33.

The square root of 13929531 is about 3732.2286907423. The cubic root of 13929531 is about 240.6091643258.

The spelling of 13929531 in words is "thirteen million, nine hundred twenty-nine thousand, five hundred thirty-one".