31489790 has 16 divisors (see below), whose sum is σ = 56933280. Its totient is φ = 12540000.

The previous prime is 31489753. The next prime is 31489817. The reversal of 31489790 is 9798413.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4586 + ... + 9165.

It is an arithmetic number, because the mean of its divisors is an integer number (3558330).

Almost surely, 2^31489790 is an apocalyptic number.

31489790 is a deficient number, since it is larger than the sum of its proper divisors (25443490).

31489790 is a wasteful number, since it uses less digits than its factorization.

31489790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13987.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 31489790 is about 5611.5764273509. The cubic root of 31489790 is about 315.7838544858.

The spelling of 31489790 in words is "thirty-one million, four hundred eighty-nine thousand, seven hundred ninety".