31402040 has 32 divisors (see below), whose sum is σ = 72301680. Its totient is φ = 12268032.

The previous prime is 31402037. The next prime is 31402069. The reversal of 31402040 is 4020413.

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 7 ways as a sum of consecutive naturals, for example, 7409 + ... + 10848.

Almost surely, 2^31402040 is an apocalyptic number.

It is an amenable number.

31402040 is an abundant number, since it is smaller than the sum of its proper divisors (40899640).

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

31402040 is a wasteful number, since it uses less digits than its factorization.

31402040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18311 (or 18307 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 31402040 is about 5603.7523142980. The cubic root of 31402040 is about 315.4902586648.

Adding to 31402040 its reverse (4020413), we get a palindrome (35422453).

The spelling of 31402040 in words is "thirty-one million, four hundred two thousand, forty".