31489380 has 72 divisors (see below), whose sum is σ = 102872952. Its totient is φ = 7750656.

The previous prime is 31489363. The next prime is 31489391. The reversal of 31489380 is 8398413.

It can be written as a sum of positive squares in 4 ways, for example, as 7518564 + 23970816 = 2742^2 + 4896^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 4389 + ... + 9068.

It is an arithmetic number, because the mean of its divisors is an integer number (1428791).

Almost surely, 2^31489380 is an apocalyptic number.

31489380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31489380 is an abundant number, since it is smaller than the sum of its proper divisors (71383572).

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

31489380 is a wasteful number, since it uses less digits than its factorization.

31489380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13485 (or 13480 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 31489380 is about 5611.5398956080. The cubic root of 31489380 is about 315.7824839681.

The spelling of 31489380 in words is "thirty-one million, four hundred eighty-nine thousand, three hundred eighty".