391704493 has 4 divisors (see below), whose sum is σ = 391744288. Its totient is φ = 391664700.

The previous prime is 391704491. The next prime is 391704517. The reversal of 391704493 is 394407193.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 391704493 - 2¹ = 391704491 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 (391704491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6880 + ... + 28822.

It is an arithmetic number, because the mean of its divisors is an integer number (97936072).

Almost surely, 2^391704493 is an apocalyptic number.

It is an amenable number.

391704493 is a deficient number, since it is larger than the sum of its proper divisors (39795).

391704493 is a wasteful number, since it uses less digits than its factorization.

391704493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39794.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 391704493 is about 19791.5257875688. The cubic root of 391704493 is about 731.6771926356.

The spelling of 391704493 in words is "three hundred ninety-one million, seven hundred four thousand, four hundred ninety-three".