31339140 has 192 divisors, whose sum is σ = 108380160. Its totient is φ = 6612480.

The previous prime is 31339103. The next prime is 31339157. The reversal of 31339140 is 4193313.

It is a self number, because there is not a number n which added to its sum of digits gives 31339140.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 377539 + ... + 377621.

It is an arithmetic number, because the mean of its divisors is an integer number (564480).

Almost surely, 2^31339140 is an apocalyptic number.

31339140 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 31339140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54190080).

31339140 is an abundant number, since it is smaller than the sum of its proper divisors (77041020).

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

31339140 is a wasteful number, since it uses less digits than its factorization.

31339140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 31339140 is about 5598.1371901732. The cubic root of 31339140 is about 315.2794697925.

The spelling of 31339140 in words is "thirty-one million, three hundred thirty-nine thousand, one hundred forty".