31139700 has 72 divisors (see below), whose sum is σ = 94035648. Its totient is φ = 7941120.

The previous prime is 31139687. The next prime is 31139701. The reversal of 31139700 is 793113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31139701) 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, 4644 + ... + 9156.

Almost surely, 2^31139700 is an apocalyptic number.

31139700 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 31139700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47017824).

31139700 is an abundant number, since it is smaller than the sum of its proper divisors (62895948).

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

31139700 is a wasteful number, since it uses less digits than its factorization.

31139700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553 (or 4546 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 24.

The square root of 31139700 is about 5580.2956910902. The cubic root of 31139700 is about 314.6092408333.

The spelling of 31139700 in words is "thirty-one million, one hundred thirty-nine thousand, seven hundred".