31465140 has 96 divisors (see below), whose sum is σ = 106014720. Its totient is φ = 6811776.

The previous prime is 31465129. The next prime is 31465153. The reversal of 31465140 is 4156413.

It is a self number, because there is not a number n which added to its sum of digits gives 31465140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6009 + ... + 9951.

It is an arithmetic number, because the mean of its divisors is an integer number (1104320).

Almost surely, 2^31465140 is an apocalyptic number.

31465140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31465140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53007360).

31465140 is an abundant number, since it is smaller than the sum of its proper divisors (74549580).

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

31465140 is a wasteful number, since it uses less digits than its factorization.

31465140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981 (or 3979 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 31465140 is about 5609.3796448449. The cubic root of 31465140 is about 315.7014351365.

The spelling of 31465140 in words is "thirty-one million, four hundred sixty-five thousand, one hundred forty".