31157974 has 8 divisors (see below), whose sum is σ = 49486248. Its totient is φ = 14662560.

The previous prime is 31157953. The next prime is 31157981. The reversal of 31157974 is 47975113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 458172 + ... + 458239.

It is an arithmetic number, because the mean of its divisors is an integer number (6185781).

Almost surely, 2^31157974 is an apocalyptic number.

31157974 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

31157974 is a deficient number, since it is larger than the sum of its proper divisors (18328274).

31157974 is a wasteful number, since it uses less digits than its factorization.

31157974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916430.

The product of its digits is 26460, while the sum is 37.

The square root of 31157974 is about 5581.9328193736. The cubic root of 31157974 is about 314.6707704885.

It can be divided in two parts, 31157 and 974, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 31157974 in words is "thirty-one million, one hundred fifty-seven thousand, nine hundred seventy-four".