31242906 has 24 divisors (see below), whose sum is σ = 71675604. Its totient is φ = 9801600.

The previous prime is 31242899. The next prime is 31242907. The reversal of 31242906 is 60924213.

It can be written as a sum of positive squares in 2 ways, for example, as 30702681 + 540225 = 5541^2 + 735^2 .

It is a super-2 number, since 2×31242906² = 1952238350649672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31242906.

It is not an unprimeable number, because it can be changed into a prime (31242907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50745 + ... + 51356.

Almost surely, 2^31242906 is an apocalyptic number.

31242906 is an abundant number, since it is smaller than the sum of its proper divisors (40432698).

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

31242906 is a wasteful number, since it uses less digits than its factorization.

31242906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102126 (or 102123 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 31242906 is about 5589.5354010866. The cubic root of 31242906 is about 314.9564263235.

The spelling of 31242906 in words is "thirty-one million, two hundred forty-two thousand, nine hundred six".