391995697 has 8 divisors (see below), whose sum is σ = 414944640. Its totient is φ = 369675600.

The previous prime is 391995679. The next prime is 391995701. The reversal of 391995697 is 796599193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391995697 - 2¹¹ = 391993649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391995397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155929 + ... + 158422.

It is an arithmetic number, because the mean of its divisors is an integer number (51868080).

Almost surely, 2^391995697 is an apocalyptic number.

It is an amenable number.

391995697 is a deficient number, since it is larger than the sum of its proper divisors (22948943).

391995697 is a wasteful number, since it uses less digits than its factorization.

391995697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314423.

The product of its digits is 4133430, while the sum is 58.

The square root of 391995697 is about 19798.8812057651. The cubic root of 391995697 is about 731.8584641049.

The spelling of 391995697 in words is "three hundred ninety-one million, nine hundred ninety-five thousand, six hundred ninety-seven".