445640931 has 12 divisors (see below), whose sum is σ = 659404200. Its totient is φ = 289847520.

The previous prime is 445640927. The next prime is 445640957. The reversal of 445640931 is 139046544.

445640931 is a `hidden beast` number, since 4 + 4 + 5 + 640 + 9 + 3 + 1 = 666.

It is not a de Polignac number, because 445640931 - 2² = 445640927 is a prime.

It is a super-2 number, since 2×445640931² = 397191678765093522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (445640911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 603481 + ... + 604218.

It is an arithmetic number, because the mean of its divisors is an integer number (54950350).

Almost surely, 2^445640931 is an apocalyptic number.

445640931 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

445640931 is a deficient number, since it is larger than the sum of its proper divisors (213763269).

445640931 is a wasteful number, since it uses less digits than its factorization.

445640931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207746 (or 1207743 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 445640931 is about 21110.2091652357. The cubic root of 445640931 is about 763.8270323556.

The spelling of 445640931 in words is "four hundred forty-five million, six hundred forty thousand, nine hundred thirty-one".