391781468 has 12 divisors (see below), whose sum is σ = 738357480. Its totient is φ = 180822192.

The previous prime is 391781447. The next prime is 391781549. The reversal of 391781468 is 864187193.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3767078 + ... + 3767181.

It is an arithmetic number, because the mean of its divisors is an integer number (61529790).

Almost surely, 2^391781468 is an apocalyptic number.

It is an amenable number.

391781468 is a deficient number, since it is larger than the sum of its proper divisors (346576012).

391781468 is a wasteful number, since it uses less digits than its factorization.

391781468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7534276 (or 7534274 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 391781468 is about 19793.4703374623. The cubic root of 391781468 is about 731.7251175076.

The spelling of 391781468 in words is "three hundred ninety-one million, seven hundred eighty-one thousand, four hundred sixty-eight".