397594151821 has 16 divisors (see below), whose sum is σ = 406019718720. Its totient is φ = 389276616960.

The previous prime is 397594151807. The next prime is 397594151849. The reversal of 397594151821 is 128151495793.

It is a cyclic number.

It is not a de Polignac number, because 397594151821 - 2⁹ = 397594151309 is a prime.

It is a super-2 number, since 2×397594151821² (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 (397594151881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4028166 + ... + 4125688.

It is an arithmetic number, because the mean of its divisors is an integer number (25376232420).

Almost surely, 2^397594151821 is an apocalyptic number.

It is an amenable number.

397594151821 is a deficient number, since it is larger than the sum of its proper divisors (8425566899).

397594151821 is a wasteful number, since it uses less digits than its factorization.

397594151821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98076.

The product of its digits is 2721600, while the sum is 55.

The spelling of 397594151821 in words is "three hundred ninety-seven billion, five hundred ninety-four million, one hundred fifty-one thousand, eight hundred twenty-one".