391026980 has 12 divisors (see below), whose sum is σ = 821156700. Its totient is φ = 156410784.

The previous prime is 391026967. The next prime is 391026983. The reversal of 391026980 is 89620193.

It can be written as a sum of positive squares in 2 ways, for example, as 250082596 + 140944384 = 15814^2 + 11872^2 .

It is not an unprimeable number, because it can be changed into a prime (391026983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9775655 + ... + 9775694.

It is an arithmetic number, because the mean of its divisors is an integer number (68429725).

Almost surely, 2^391026980 is an apocalyptic number.

It is an amenable number.

391026980 is an abundant number, since it is smaller than the sum of its proper divisors (430129720).

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

391026980 is a wasteful number, since it uses less digits than its factorization.

391026980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19551358 (or 19551356 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 391026980 is about 19774.4021401407. The cubic root of 391026980 is about 731.2550998743.

The spelling of 391026980 in words is "three hundred ninety-one million, twenty-six thousand, nine hundred eighty".