31897047 has 32 divisors (see below), whose sum is σ = 54046720. Its totient is φ = 16277760.

The previous prime is 31897037. The next prime is 31897069. The reversal of 31897047 is 74079813.

It is not a de Polignac number, because 31897047 - 2⁷ = 31896919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 31896996 and 31897014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31897027) 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 31 ways as a sum of consecutive naturals, for example, 6579 + ... + 10347.

It is an arithmetic number, because the mean of its divisors is an integer number (1688960).

Almost surely, 2^31897047 is an apocalyptic number.

31897047 is a deficient number, since it is larger than the sum of its proper divisors (22149673).

31897047 is a wasteful number, since it uses less digits than its factorization.

31897047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 31897047 is about 5647.7470729486. The cubic root of 31897047 is about 317.1393702296.

The spelling of 31897047 in words is "thirty-one million, eight hundred ninety-seven thousand, forty-seven".