391396867 has 2 divisors, whose sum is σ = 391396868. Its totient is φ = 391396866.

The previous prime is 391396861. The next prime is 391396877. The reversal of 391396867 is 768693193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391396867 - 2¹¹ = 391394819 is a prime.

It is not a weakly prime, because it can be changed into another prime (391396861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195698433 + 195698434.

It is an arithmetic number, because the mean of its divisors is an integer number (195698434).

Almost surely, 2^391396867 is an apocalyptic number.

391396867 is a deficient number, since it is larger than the sum of its proper divisors (1).

391396867 is an equidigital number, since it uses as much as digits as its factorization.

391396867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 391396867 is about 19783.7526015668. The cubic root of 391396867 is about 731.4856010311.

The spelling of 391396867 in words is "three hundred ninety-one million, three hundred ninety-six thousand, eight hundred sixty-seven".