31040690 has 16 divisors (see below), whose sum is σ = 57236760. Its totient is φ = 12113280.

The previous prime is 31040689. The next prime is 31040707. The reversal of 31040690 is 9604013.

It can be written as a sum of positive squares in 4 ways, for example, as 22648081 + 8392609 = 4759^2 + 2897^2 .

It is a super-2 number, since 2×31040690² = 1927048871352200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37445 + ... + 38264.

Almost surely, 2^31040690 is an apocalyptic number.

31040690 is a deficient number, since it is larger than the sum of its proper divisors (26196070).

31040690 is a wasteful number, since it uses less digits than its factorization.

31040690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75757.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31040690 is about 5571.4172344207. The cubic root of 31040690 is about 314.2754489957.

The spelling of 31040690 in words is "thirty-one million, forty thousand, six hundred ninety".