31440057 has 24 divisors (see below), whose sum is σ = 47832288. Its totient is φ = 18216000.

The previous prime is 31440049. The next prime is 31440061. The reversal of 31440057 is 75004413.

It is not a de Polignac number, because 31440057 - 2³ = 31440049 is a prime.

It is a super-3 number, since 3×31440057³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31440067) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16557 + ... + 18357.

It is an arithmetic number, because the mean of its divisors is an integer number (1993012).

Almost surely, 2^31440057 is an apocalyptic number.

It is an amenable number.

31440057 is a deficient number, since it is larger than the sum of its proper divisors (16392231).

31440057 is a wasteful number, since it uses less digits than its factorization.

31440057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 31440057 is about 5607.1433903548. The cubic root of 31440057 is about 315.6175238173.

The spelling of 31440057 in words is "thirty-one million, four hundred forty thousand, fifty-seven".