31497402 has 16 divisors (see below), whose sum is σ = 66310560. Its totient is φ = 9946512.

The previous prime is 31497391. The next prime is 31497409. The reversal of 31497402 is 20479413.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31497402.

It is not an unprimeable number, because it can be changed into a prime (31497409) 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 7 ways as a sum of consecutive naturals, for example, 138033 + ... + 138260.

It is an arithmetic number, because the mean of its divisors is an integer number (4144410).

Almost surely, 2^31497402 is an apocalyptic number.

31497402 is an abundant number, since it is smaller than the sum of its proper divisors (34813158).

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

31497402 is a wasteful number, since it uses less digits than its factorization.

31497402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276317.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 31497402 is about 5612.2546271530. The cubic root of 31497402 is about 315.8092971562.

The spelling of 31497402 in words is "thirty-one million, four hundred ninety-seven thousand, four hundred two".