31208742 has 24 divisors (see below), whose sum is σ = 67752360. Its totient is φ = 10382400.

The previous prime is 31208731. The next prime is 31208761. The reversal of 31208742 is 24780213.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9742 + ... + 12542.

It is an arithmetic number, because the mean of its divisors is an integer number (2823015).

Almost surely, 2^31208742 is an apocalyptic number.

31208742 is an abundant number, since it is smaller than the sum of its proper divisors (36543618).

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

31208742 is a wasteful number, since it uses less digits than its factorization.

31208742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428 (or 3425 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 31208742 is about 5586.4784972288. The cubic root of 31208742 is about 314.8415832313.

Adding to 31208742 its reverse (24780213), we get a palindrome (55988955).

The spelling of 31208742 in words is "thirty-one million, two hundred eight thousand, seven hundred forty-two".