30931290 has 48 divisors (see below), whose sum is σ = 86610888. Its totient is φ = 7613568.

The previous prime is 30931289. The next prime is 30931301. The reversal of 30931290 is 9213903.

It can be written as a sum of positive squares in 4 ways, for example, as 24413481 + 6517809 = 4941^2 + 2553^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12049 + ... + 14388.

Almost surely, 2^30931290 is an apocalyptic number.

30931290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30931290 is an abundant number, since it is smaller than the sum of its proper divisors (55679598).

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

30931290 is a wasteful number, since it uses less digits than its factorization.

30931290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26463 (or 26460 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 30931290 is about 5561.5905998194. The cubic root of 30931290 is about 313.9058029480.

The spelling of 30931290 in words is "thirty million, nine hundred thirty-one thousand, two hundred ninety".