31392047 has 12 divisors (see below), whose sum is σ = 35108520. Its totient is φ = 27985536.

The previous prime is 31392017. The next prime is 31392073. The reversal of 31392047 is 74029313.

It is not a de Polignac number, because 31392047 - 2⁸ = 31391791 is a prime.

It is a super-2 number, since 2×31392047² = 1970921229700418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31392017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2633 + ... + 8349.

It is an arithmetic number, because the mean of its divisors is an integer number (2925710).

Almost surely, 2^31392047 is an apocalyptic number.

31392047 is a deficient number, since it is larger than the sum of its proper divisors (3716473).

31392047 is a wasteful number, since it uses less digits than its factorization.

31392047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5770 (or 5753 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 31392047 is about 5602.8606086534. The cubic root of 31392047 is about 315.4567891977.

The spelling of 31392047 in words is "thirty-one million, three hundred ninety-two thousand, forty-seven".