31439742 has 16 divisors (see below), whose sum is σ = 63457680. Its totient is φ = 10383552.

The previous prime is 31439729. The next prime is 31439761. The reversal of 31439742 is 24793413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23383 + ... + 24690.

It is an arithmetic number, because the mean of its divisors is an integer number (3966105).

Almost surely, 2^31439742 is an apocalyptic number.

31439742 is an abundant number, since it is smaller than the sum of its proper divisors (32017938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31439742 is a wasteful number, since it uses less digits than its factorization.

31439742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48187.

The product of its digits is 18144, while the sum is 33.

The square root of 31439742 is about 5607.1153011152. The cubic root of 31439742 is about 315.6164697495.

The spelling of 31439742 in words is "thirty-one million, four hundred thirty-nine thousand, seven hundred forty-two".