31289842 has 8 divisors (see below), whose sum is σ = 47596032. Its totient is φ = 15424500.

The previous prime is 31289837. The next prime is 31289857. The reversal of 31289842 is 24898213.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110034 + ... + 110317.

It is an arithmetic number, because the mean of its divisors is an integer number (5949504).

Almost surely, 2^31289842 is an apocalyptic number.

31289842 is a deficient number, since it is larger than the sum of its proper divisors (16306190).

31289842 is a wasteful number, since it uses less digits than its factorization.

31289842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220424.

The product of its digits is 27648, while the sum is 37.

The square root of 31289842 is about 5593.7323854471. The cubic root of 31289842 is about 315.1140663576.

It can be divided in two parts, 31289 and 842, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 31289842 in words is "thirty-one million, two hundred eighty-nine thousand, eight hundred forty-two".