31457140 has 96 divisors (see below), whose sum is σ = 82301184. Its totient is φ = 9922560.

The previous prime is 31457119. The next prime is 31457149. The reversal of 31457140 is 4175413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31457149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48297 + ... + 48943.

It is an arithmetic number, because the mean of its divisors is an integer number (857304).

Almost surely, 2^31457140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31457140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41150592).

31457140 is an abundant number, since it is smaller than the sum of its proper divisors (50844044).

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

31457140 is a wasteful number, since it uses less digits than its factorization.

31457140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 695 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 31457140 is about 5608.6665081818. Note that the first 3 decimals coincide. The cubic root of 31457140 is about 315.6746772116.

The spelling of 31457140 in words is "thirty-one million, four hundred fifty-seven thousand, one hundred forty".