31242388 has 12 divisors (see below), whose sum is σ = 55601280. Its totient is φ = 15356312.

The previous prime is 31242383. The next prime is 31242397. The reversal of 31242388 is 88324213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242383) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 65956 + ... + 66427.

It is an arithmetic number, because the mean of its divisors is an integer number (4633440).

Almost surely, 2^31242388 is an apocalyptic number.

It is an amenable number.

31242388 is a deficient number, since it is larger than the sum of its proper divisors (24358892).

31242388 is a wasteful number, since it uses less digits than its factorization.

31242388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132446 (or 132444 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 31242388 is about 5589.4890643063. The cubic root of 31242388 is about 314.9546856795.

The spelling of 31242388 in words is "thirty-one million, two hundred forty-two thousand, three hundred eighty-eight".