13440931 has 16 divisors (see below), whose sum is σ = 16381440. Its totient is φ = 10765440.

The previous prime is 13440929. The next prime is 13440941. The reversal of 13440931 is 13904431.

It is a happy number.

It is not a de Polignac number, because 13440931 - 2¹ = 13440929 is a prime.

It is a super-2 number, since 2×13440931² = 361317252293522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13440896 and 13440905.

It is not an unprimeable number, because it can be changed into a prime (13440941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20986 + ... + 21616.

It is an arithmetic number, because the mean of its divisors is an integer number (1023840).

Almost surely, 2^13440931 is an apocalyptic number.

13440931 is a deficient number, since it is larger than the sum of its proper divisors (2940509).

13440931 is a wasteful number, since it uses less digits than its factorization.

13440931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 13440931 is about 3666.1875293007. The cubic root of 13440931 is about 237.7623678561.

The spelling of 13440931 in words is "thirteen million, four hundred forty thousand, nine hundred thirty-one".