391480693 has 4 divisors (see below), whose sum is σ = 412084960. Its totient is φ = 370876428.

The previous prime is 391480673. The next prime is 391480721. The reversal of 391480693 is 396084193.

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.

It is not a de Polignac number, because 391480693 - 2⁹ = 391480181 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 (391480613) 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, 10302105 + ... + 10302142.

It is an arithmetic number, because the mean of its divisors is an integer number (103021240).

Almost surely, 2^391480693 is an apocalyptic number.

It is an amenable number.

391480693 is a deficient number, since it is larger than the sum of its proper divisors (20604267).

391480693 is a wasteful number, since it uses less digits than its factorization.

391480693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20604266.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 391480693 is about 19785.8710447632. The cubic root of 391480693 is about 731.5378183926.

The spelling of 391480693 in words is "three hundred ninety-one million, four hundred eighty thousand, six hundred ninety-three".