31243980 has 48 divisors (see below), whose sum is σ = 92090880. Its totient is φ = 7892928.

The previous prime is 31243967. The next prime is 31244077. The reversal of 31243980 is 8934213.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12564 + ... + 14843.

It is an arithmetic number, because the mean of its divisors is an integer number (1918560).

Almost surely, 2^31243980 is an apocalyptic number.

31243980 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31243980 is an abundant number, since it is smaller than the sum of its proper divisors (60846900).

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

31243980 is a wasteful number, since it uses less digits than its factorization.

31243980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27438 (or 27436 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 31243980 is about 5589.6314726465. The cubic root of 31243980 is about 314.9600352422.

It can be divided in two parts, 31243 and 980, that added together give a palindrome (32223).

The spelling of 31243980 in words is "thirty-one million, two hundred forty-three thousand, nine hundred eighty".