31293040 has 20 divisors (see below), whose sum is σ = 72756504. Its totient is φ = 12517184.

The previous prime is 31293029. The next prime is 31293047. The reversal of 31293040 is 4039213.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31293047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195502 + ... + 195661.

Almost surely, 2^31293040 is an apocalyptic number.

It is an amenable number.

31293040 is an abundant number, since it is smaller than the sum of its proper divisors (41463464).

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

31293040 is a wasteful number, since it uses less digits than its factorization.

31293040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391176 (or 391170 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 31293040 is about 5594.0182337922. The cubic root of 31293040 is about 315.1248014758.

The spelling of 31293040 in words is "thirty-one million, two hundred ninety-three thousand, forty".