390727666597 has 4 divisors (see below), whose sum is σ = 396080100460. Its totient is φ = 385375232736.

The previous prime is 390727666561. The next prime is 390727666607. The reversal of 390727666597 is 795666727093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179978729121 + 210748937476 = 424239^2 + 459074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390727666597 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 (390727666547) 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, 2676216822 + ... + 2676216967.

It is an arithmetic number, because the mean of its divisors is an integer number (99020025115).

Almost surely, 2^390727666597 is an apocalyptic number.

It is an amenable number.

390727666597 is a deficient number, since it is larger than the sum of its proper divisors (5352433863).

390727666597 is an equidigital number, since it uses as much as digits as its factorization.

390727666597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352433862.

The product of its (nonzero) digits is 180033840, while the sum is 67.

The spelling of 390727666597 in words is "three hundred ninety billion, seven hundred twenty-seven million, six hundred sixty-six thousand, five hundred ninety-seven".