13431645 has 24 divisors (see below), whose sum is σ = 23680800. Its totient is φ = 7040736.

The previous prime is 13431619. The next prime is 13431661. The reversal of 13431645 is 54613431.

13431645 = T₁₄₂ + T₁₄₃ + ... + T₄₃₆.

13431645 is a `hidden beast` number, since 13 + 4 + 3 + 1 + 645 = 666.

13431645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13431645 - 2⁹ = 13431133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126 + ... + 5184.

It is an arithmetic number, because the mean of its divisors is an integer number (986700).

Almost surely, 2^13431645 is an apocalyptic number.

13431645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13431645 is a deficient number, since it is larger than the sum of its proper divisors (10249155).

13431645 is a wasteful number, since it uses less digits than its factorization.

13431645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129 (or 5126 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 13431645 is about 3664.9208722700. The cubic root of 13431645 is about 237.7076005687.

The spelling of 13431645 in words is "thirteen million, four hundred thirty-one thousand, six hundred forty-five".