31553940 has 48 divisors (see below), whose sum is σ = 96384960. Its totient is φ = 7649280.

The previous prime is 31553903. The next prime is 31553983. The reversal of 31553940 is 4935513.

It is a super-2 number, since 2×31553940² = 1991302259047200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31553898 and 31553907.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23245 + ... + 24564.

It is an arithmetic number, because the mean of its divisors is an integer number (2008020).

Almost surely, 2^31553940 is an apocalyptic number.

31553940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31553940 is an abundant number, since it is smaller than the sum of its proper divisors (64831020).

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

31553940 is a wasteful number, since it uses less digits than its factorization.

31553940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47832 (or 47830 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 31553940 is about 5617.2893818994. The cubic root of 31553940 is about 315.9981439831.

The spelling of 31553940 in words is "thirty-one million, five hundred fifty-three thousand, nine hundred forty".