47399931 has 8 divisors (see below), whose sum is σ = 70222160. Its totient is φ = 31599936.

The previous prime is 47399929. The next prime is 47399939. The reversal of 47399931 is 13999374.

47399931 is a `hidden beast` number, since 473 + 99 + 93 + 1 = 666.

It is not a de Polignac number, because 47399931 - 2¹ = 47399929 is a prime.

It is a super-2 number, since 2×47399931² = 4493506917609522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47399939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877750 + ... + 877803.

It is an arithmetic number, because the mean of its divisors is an integer number (8777770).

Almost surely, 2^47399931 is an apocalyptic number.

47399931 is a deficient number, since it is larger than the sum of its proper divisors (22822229).

47399931 is a wasteful number, since it uses less digits than its factorization.

47399931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755562 (or 1755556 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 47399931 is about 6884.7607801579. The cubic root of 47399931 is about 361.9033221679.

The spelling of 47399931 in words is "forty-seven million, three hundred ninety-nine thousand, nine hundred thirty-one".