31430988 has 18 divisors (see below), whose sum is σ = 79450644. Its totient is φ = 10476984.

The previous prime is 31430957. The next prime is 31431013. The reversal of 31430988 is 88903413.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×31430988² = 1975814013312288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 873083 = 31430988 / (3 + 1 + 4 + 3 + 0 + 9 + 8 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 436506 + ... + 436577.

Almost surely, 2^31430988 is an apocalyptic number.

It is an amenable number.

31430988 is an abundant number, since it is smaller than the sum of its proper divisors (48019656).

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

31430988 is a wasteful number, since it uses less digits than its factorization.

31430988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873093 (or 873088 counting only the distinct ones).

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

The square root of 31430988 is about 5606.3346314682. The cubic root of 31430988 is about 315.5871738873.

The spelling of 31430988 in words is "thirty-one million, four hundred thirty thousand, nine hundred eighty-eight".