31421744 has 40 divisors (see below), whose sum is σ = 65672880. Its totient is φ = 14515200.

The previous prime is 31421737. The next prime is 31421759. The reversal of 31421744 is 44712413.

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, 11204 + ... + 13724.

It is an arithmetic number, because the mean of its divisors is an integer number (1641822).

Almost surely, 2^31421744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31421744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32836440).

31421744 is an abundant number, since it is smaller than the sum of its proper divisors (34251136).

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

31421744 is a wasteful number, since it uses less digits than its factorization.

31421744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589 (or 2583 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 31421744 is about 5605.5101462757. The cubic root of 31421744 is about 315.5562323011.

The spelling of 31421744 in words is "thirty-one million, four hundred twenty-one thousand, seven hundred forty-four".