31323040 has 48 divisors (see below), whose sum is σ = 84575232. Its totient is φ = 10738944.

The previous prime is 31323023. The next prime is 31323107. The reversal of 31323040 is 4032313.

It is a super-2 number, since 2×31323040² = 1962265669683200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12864 + ... + 15103.

It is an arithmetic number, because the mean of its divisors is an integer number (1761984).

Almost surely, 2^31323040 is an apocalyptic number.

It is an amenable number.

31323040 is an abundant number, since it is smaller than the sum of its proper divisors (53252192).

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

31323040 is a wasteful number, since it uses less digits than its factorization.

31323040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27989 (or 27981 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 31323040 is about 5596.6990271052. The cubic root of 31323040 is about 315.2254705555.

Adding to 31323040 its reverse (4032313), we get a palindrome (35355353).

The spelling of 31323040 in words is "thirty-one million, three hundred twenty-three thousand, forty".