31472240 has 20 divisors (see below), whose sum is σ = 73173144. Its totient is φ = 12588864.

The previous prime is 31472239. The next prime is 31472261. The reversal of 31472240 is 4227413.

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

It is a congruent number.

It is an unprimeable number.

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, 196622 + ... + 196781.

Almost surely, 2^31472240 is an apocalyptic number.

It is an amenable number.

31472240 is an abundant number, since it is smaller than the sum of its proper divisors (41700904).

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

31472240 is a wasteful number, since it uses less digits than its factorization.

31472240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393416 (or 393410 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 31472240 is about 5610.0124777045. The cubic root of 31472240 is about 315.7251789963.

Adding to 31472240 its reverse (4227413), we get a palindrome (35699653).

The spelling of 31472240 in words is "thirty-one million, four hundred seventy-two thousand, two hundred forty".