31894240 has 48 divisors (see below), whose sum is σ = 86117472. Its totient is φ = 10934784.

The previous prime is 31894231. The next prime is 31894241. The reversal of 31894240 is 4249813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31894241) 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, 13119 + ... + 15358.

It is an arithmetic number, because the mean of its divisors is an integer number (1794114).

Almost surely, 2^31894240 is an apocalyptic number.

It is an amenable number.

31894240 is an abundant number, since it is smaller than the sum of its proper divisors (54223232).

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

31894240 is a wasteful number, since it uses less digits than its factorization.

31894240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28499 (or 28491 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 31894240 is about 5647.4985613101. The cubic root of 31894240 is about 317.1300670034.

The spelling of 31894240 in words is "thirty-one million, eight hundred ninety-four thousand, two hundred forty".