391680023 has 4 divisors (see below), whose sum is σ = 447634320. Its totient is φ = 335725728.

The previous prime is 391680007. The next prime is 391680031. The reversal of 391680023 is 320086193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 391680023 - 2⁴ = 391680007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391680043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27977138 + ... + 27977151.

It is an arithmetic number, because the mean of its divisors is an integer number (111908580).

Almost surely, 2^391680023 is an apocalyptic number.

391680023 is a deficient number, since it is larger than the sum of its proper divisors (55954297).

391680023 is an equidigital number, since it uses as much as digits as its factorization.

391680023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55954296.

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

The square root of 391680023 is about 19790.9075840397. The cubic root of 391680023 is about 731.6619562231.

The spelling of 391680023 in words is "three hundred ninety-one million, six hundred eighty thousand, twenty-three".