31499970 has 16 divisors (see below), whose sum is σ = 75600000. Its totient is φ = 8399984.

The previous prime is 31499939. The next prime is 31499989. The reversal of 31499970 is 7999413.

It is a super-2 number, since 2×31499970² = 1984496220001800, 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, 524970 + ... + 525029.

It is an arithmetic number, because the mean of its divisors is an integer number (4725000).

Almost surely, 2^31499970 is an apocalyptic number.

31499970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31499970 is an abundant number, since it is smaller than the sum of its proper divisors (44100030).

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

31499970 is a wasteful number, since it uses less digits than its factorization.

31499970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050009.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 31499970 is about 5612.4834075479. The cubic root of 31499970 is about 315.8178796231.

The spelling of 31499970 in words is "thirty-one million, four hundred ninety-nine thousand, nine hundred seventy".