31404040 has 16 divisors (see below), whose sum is σ = 70659180. Its totient is φ = 12561600.

The previous prime is 31404011. The next prime is 31404047. The reversal of 31404040 is 4040413.

It can be written as a sum of positive squares in 2 ways, for example, as 27019204 + 4384836 = 5198^2 + 2094^2 .

It is not an unprimeable number, because it can be changed into a prime (31404047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392511 + ... + 392590.

Almost surely, 2^31404040 is an apocalyptic number.

It is an amenable number.

31404040 is an abundant number, since it is smaller than the sum of its proper divisors (39255140).

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

31404040 is a wasteful number, since it uses less digits than its factorization.

31404040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785112 (or 785108 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31404040 is about 5603.9307633125. The cubic root of 31404040 is about 315.4969563945.

Adding to 31404040 its reverse (4040413), we get a palindrome (35444453).

The spelling of 31404040 in words is "thirty-one million, four hundred four thousand, forty".