391967 has 2 divisors, whose sum is σ = 391968. Its totient is φ = 391966.

The previous prime is 391961. The next prime is 391987. The reversal of 391967 is 769193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391967 - 2⁶ = 391903 is a prime.

It is a Chen prime.

It is a plaindrome in base 6.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195983 + 195984.

It is an arithmetic number, because the mean of its divisors is an integer number (195984).

2³⁹¹⁹⁶⁷ is an apocalyptic number.

391967 is a deficient number, since it is larger than the sum of its proper divisors (1).

391967 is an equidigital number, since it uses as much as digits as its factorization.

391967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 35.

The square root of 391967 is about 626.0726794870. The cubic root of 391967 is about 73.1840604508.

The spelling of 391967 in words is "three hundred ninety-one thousand, nine hundred sixty-seven".