391216604 has 6 divisors (see below), whose sum is σ = 684629064. Its totient is φ = 195608300.

The previous prime is 391216601. The next prime is 391216627. The reversal of 391216604 is 406612193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391216601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48902072 + ... + 48902079.

It is an arithmetic number, because the mean of its divisors is an integer number (114104844).

Almost surely, 2^391216604 is an apocalyptic number.

It is an amenable number.

391216604 is a deficient number, since it is larger than the sum of its proper divisors (293412460).

391216604 is a wasteful number, since it uses less digits than its factorization.

391216604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97804155 (or 97804153 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 391216604 is about 19779.1962425170. The cubic root of 391216604 is about 731.3732853328.

Adding to 391216604 its reverse (406612193), we get a palindrome (797828797).

The spelling of 391216604 in words is "three hundred ninety-one million, two hundred sixteen thousand, six hundred four".