31379930 has 8 divisors (see below), whose sum is σ = 56483892. Its totient is φ = 12551968.

The previous prime is 31379923. The next prime is 31379939. The reversal of 31379930 is 3997313.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25411681 + 5968249 = 5041^2 + 2443^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31379939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568987 + ... + 1569006.

Almost surely, 2^31379930 is an apocalyptic number.

31379930 is a deficient number, since it is larger than the sum of its proper divisors (25103962).

31379930 is a wasteful number, since it uses less digits than its factorization.

31379930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138000.

The product of its (nonzero) digits is 15309, while the sum is 35.

The square root of 31379930 is about 5601.7791816529. The cubic root of 31379930 is about 315.4161963067.

The spelling of 31379930 in words is "thirty-one million, three hundred seventy-nine thousand, nine hundred thirty".