31139926 has 4 divisors (see below), whose sum is σ = 46709892. Its totient is φ = 15569962.

The previous prime is 31139893. The next prime is 31139929. The reversal of 31139926 is 62993113.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 31139891 and 31139900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31139929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7784980 + ... + 7784983.

It is an arithmetic number, because the mean of its divisors is an integer number (11677473).

Almost surely, 2^31139926 is an apocalyptic number.

31139926 is a deficient number, since it is larger than the sum of its proper divisors (15569966).

31139926 is a wasteful number, since it uses less digits than its factorization.

31139926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15569965.

The product of its digits is 8748, while the sum is 34.

The square root of 31139926 is about 5580.3159408765. The cubic root of 31139926 is about 314.6100019358.

The spelling of 31139926 in words is "thirty-one million, one hundred thirty-nine thousand, nine hundred twenty-six".