31489290 has 64 divisors (see below), whose sum is σ = 95973120. Its totient is φ = 7197120.

The previous prime is 31489279. The next prime is 31489349. The reversal of 31489290 is 9298413.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6441 + ... + 10220.

It is an arithmetic number, because the mean of its divisors is an integer number (1499580).

Almost surely, 2^31489290 is an apocalyptic number.

31489290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31489290 is an abundant number, since it is smaller than the sum of its proper divisors (64483830).

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

31489290 is a wasteful number, since it uses less digits than its factorization.

31489290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16684 (or 16678 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 31489290 is about 5611.5318764131. The cubic root of 31489290 is about 315.7821831212.

The spelling of 31489290 in words is "thirty-one million, four hundred eighty-nine thousand, two hundred ninety".