31000386 has 16 divisors (see below), whose sum is σ = 62223264. Its totient is φ = 10296384.

The previous prime is 31000351. The next prime is 31000397. The reversal of 31000386 is 68300013.

It is a super-2 number, since 2×31000386² = 1922047864297992, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7431 + ... + 10826.

It is an arithmetic number, because the mean of its divisors is an integer number (3888954).

Almost surely, 2^31000386 is an apocalyptic number.

31000386 is an abundant number, since it is smaller than the sum of its proper divisors (31222878).

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

31000386 is a wasteful number, since it uses less digits than its factorization.

31000386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18545.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 31000386 is about 5567.7990265454. The cubic root of 31000386 is about 314.1393690756.

Adding to 31000386 its reverse (68300013), we get a palindrome (99300399).

The spelling of 31000386 in words is "thirty-one million, three hundred eighty-six", and thus it is an aban number.