391797945 has 64 divisors (see below), whose sum is σ = 868423680. Its totient is φ = 162820800.

The previous prime is 391797919. The next prime is 391797949. The reversal of 391797945 is 549797193.

It is a happy number.

It is not a de Polignac number, because 391797945 - 2⁷ = 391797817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391797891 and 391797900.

It is not an unprimeable number, because it can be changed into a prime (391797949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8451 + ... + 29240.

It is an arithmetic number, because the mean of its divisors is an integer number (13569120).

Almost surely, 2^391797945 is an apocalyptic number.

391797945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

391797945 is an abundant number, since it is smaller than the sum of its proper divisors (476625735).

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

391797945 is a wasteful number, since it uses less digits than its factorization.

391797945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37723 (or 37717 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 54.

The square root of 391797945 is about 19793.8865562072. The cubic root of 391797945 is about 731.7353753228.

The spelling of 391797945 in words is "three hundred ninety-one million, seven hundred ninety-seven thousand, nine hundred forty-five".