31830139 has 24 divisors (see below), whose sum is σ = 37154880. Its totient is φ = 27202560.

The previous prime is 31830133. The next prime is 31830143. The reversal of 31830139 is 93103813.

It is not a de Polignac number, because 31830139 - 2³ = 31830131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31830131) 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, 164827 + ... + 165019.

It is an arithmetic number, because the mean of its divisors is an integer number (1548120).

Almost surely, 2^31830139 is an apocalyptic number.

31830139 is a deficient number, since it is larger than the sum of its proper divisors (5324741).

31830139 is a wasteful number, since it uses less digits than its factorization.

31830139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31830139 is about 5641.8205395067. The cubic root of 31830139 is about 316.9174686546.

The spelling of 31830139 in words is "thirty-one million, eight hundred thirty thousand, one hundred thirty-nine".