391234867 has 4 divisors (see below), whose sum is σ = 391380856. Its totient is φ = 391088880.

The previous prime is 391234843. The next prime is 391234897. The reversal of 391234867 is 768432193.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391234867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391234897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68898 + ... + 74359.

It is an arithmetic number, because the mean of its divisors is an integer number (97845214).

Almost surely, 2^391234867 is an apocalyptic number.

391234867 is a deficient number, since it is larger than the sum of its proper divisors (145989).

391234867 is a wasteful number, since it uses less digits than its factorization.

391234867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145988.

The product of its digits is 217728, while the sum is 43.

The square root of 391234867 is about 19779.6579090742. The cubic root of 391234867 is about 731.3846659527.

The spelling of 391234867 in words is "three hundred ninety-one million, two hundred thirty-four thousand, eight hundred sixty-seven".