397221423 has 4 divisors (see below), whose sum is σ = 529628568. Its totient is φ = 264814280.

The previous prime is 397221421. The next prime is 397221443. The reversal of 397221423 is 324122793.

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

It is a cyclic number.

It is not a de Polignac number, because 397221423 - 2¹ = 397221421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397221421) 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, 66203568 + ... + 66203573.

It is an arithmetic number, because the mean of its divisors is an integer number (132407142).

Almost surely, 2^397221423 is an apocalyptic number.

397221423 is a deficient number, since it is larger than the sum of its proper divisors (132407145).

397221423 is a wasteful number, since it uses less digits than its factorization.

397221423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132407144.

The product of its digits is 18144, while the sum is 33.

The square root of 397221423 is about 19930.4145215297. The cubic root of 397221423 is about 735.0962731960.

The spelling of 397221423 in words is "three hundred ninety-seven million, two hundred twenty-one thousand, four hundred twenty-three".