397217857597 has 4 divisors (see below), whose sum is σ = 433328571936. Its totient is φ = 361107143260.

The previous prime is 397217857579. The next prime is 397217857607. The reversal of 397217857597 is 795758712793.

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 a cyclic number.

It is not a de Polignac number, because 397217857597 - 2⁷ = 397217857469 is a prime.

It is a super-2 number, since 2×397217857597² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397217857537) 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, 18055357153 + ... + 18055357174.

It is an arithmetic number, because the mean of its divisors is an integer number (108332142984).

Almost surely, 2^397217857597 is an apocalyptic number.

It is an amenable number.

397217857597 is a deficient number, since it is larger than the sum of its proper divisors (36110714339).

397217857597 is a wasteful number, since it uses less digits than its factorization.

397217857597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36110714338.

The product of its digits is 233377200, while the sum is 70.

The spelling of 397217857597 in words is "three hundred ninety-seven billion, two hundred seventeen million, eight hundred fifty-seven thousand, five hundred ninety-seven".