391669407 has 12 divisors (see below), whose sum is σ = 583994944. Its totient is φ = 252689760.

The previous prime is 391669391. The next prime is 391669423. The reversal of 391669407 is 704966193.

It is an interprime number because it is at equal distance from previous prime (391669391) and next prime (391669423).

It is not a de Polignac number, because 391669407 - 2⁴ = 391669391 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 (391669427) 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 11 ways as a sum of consecutive naturals, for example, 701638 + ... + 702195.

Almost surely, 2^391669407 is an apocalyptic number.

391669407 is a deficient number, since it is larger than the sum of its proper divisors (192325537).

391669407 is a wasteful number, since it uses less digits than its factorization.

391669407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403870 (or 1403867 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 391669407 is about 19790.6393782515. The cubic root of 391669407 is about 731.6553459008.

The spelling of 391669407 in words is "three hundred ninety-one million, six hundred sixty-nine thousand, four hundred seven".