31439700 has 108 divisors (see below), whose sum is σ = 99603868. Its totient is φ = 8294400.

The previous prime is 31439693. The next prime is 31439701. The reversal of 31439700 is 793413.

It can be written as a sum of positive squares in 6 ways, for example, as 10536516 + 20903184 = 3246^2 + 4572^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31439701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 162804 + ... + 162996.

Almost surely, 2^31439700 is an apocalyptic number.

31439700 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 31439700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49801934).

31439700 is an abundant number, since it is smaller than the sum of its proper divisors (68164168).

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

31439700 is a wasteful number, since it uses less digits than its factorization.

31439700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 31439700 is about 5607.1115558726. Note that the first 3 decimals coincide. The cubic root of 31439700 is about 315.6163292066.

The spelling of 31439700 in words is "thirty-one million, four hundred thirty-nine thousand, seven hundred".