31042478 has 12 divisors (see below), whose sum is σ = 47244120. Its totient is φ = 15297660.

The previous prime is 31042469. The next prime is 31042489. The reversal of 31042478 is 87424013.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31042478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8543 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (3937010).

Almost surely, 2^31042478 is an apocalyptic number.

31042478 is a deficient number, since it is larger than the sum of its proper divisors (16201642).

31042478 is an equidigital number, since it uses as much as digits as its factorization.

31042478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223 (or 3152 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 31042478 is about 5571.5776939750. The cubic root of 31042478 is about 314.2814831583.

The spelling of 31042478 in words is "thirty-one million, forty-two thousand, four hundred seventy-eight".