391306797 has 72 divisors (see below), whose sum is σ = 693149184. Its totient is φ = 211692096.

The previous prime is 391306793. The next prime is 391306801. The reversal of 391306797 is 797603193.

It is an interprime number because it is at equal distance from previous prime (391306793) and next prime (391306801).

It is not a de Polignac number, because 391306797 - 2² = 391306793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391306793) 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 71 ways as a sum of consecutive naturals, for example, 1754628 + ... + 1754850.

It is an arithmetic number, because the mean of its divisors is an integer number (9627072).

Almost surely, 2^391306797 is an apocalyptic number.

It is an amenable number.

391306797 is a deficient number, since it is larger than the sum of its proper divisors (301842387).

391306797 is a wasteful number, since it uses less digits than its factorization.

391306797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 45.

The square root of 391306797 is about 19781.4761077125. The cubic root of 391306797 is about 731.4294858122.

The spelling of 391306797 in words is "three hundred ninety-one million, three hundred six thousand, seven hundred ninety-seven".