391942367 has 4 divisors (see below), whose sum is σ = 399337560. Its totient is φ = 384547176.

The previous prime is 391942357. The next prime is 391942373. The reversal of 391942367 is 763249193.

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 391942367 - 2¹⁶ = 391876831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391942307) 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 3 ways as a sum of consecutive naturals, for example, 3697517 + ... + 3697622.

It is an arithmetic number, because the mean of its divisors is an integer number (99834390).

Almost surely, 2^391942367 is an apocalyptic number.

391942367 is a deficient number, since it is larger than the sum of its proper divisors (7395193).

391942367 is an equidigital number, since it uses as much as digits as its factorization.

391942367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7395192.

The product of its digits is 244944, while the sum is 44.

The square root of 391942367 is about 19797.5343666831. The cubic root of 391942367 is about 731.8252734498.

The spelling of 391942367 in words is "three hundred ninety-one million, nine hundred forty-two thousand, three hundred sixty-seven".