31139706 has 16 divisors (see below), whose sum is σ = 67070304. Its totient is φ = 9581424.

The previous prime is 31139701. The next prime is 31139729. The reversal of 31139706 is 60793113.

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 7 ways as a sum of consecutive naturals, for example, 199536 + ... + 199691.

It is an arithmetic number, because the mean of its divisors is an integer number (4191894).

Almost surely, 2^31139706 is an apocalyptic number.

31139706 is an abundant number, since it is smaller than the sum of its proper divisors (35930598).

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

31139706 is a wasteful number, since it uses less digits than its factorization.

31139706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399245.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 31139706 is about 5580.2962286961. The cubic root of 31139706 is about 314.6092610396.

The spelling of 31139706 in words is "thirty-one million, one hundred thirty-nine thousand, seven hundred six".