397492221 has 16 divisors (see below), whose sum is σ = 622073984. Its totient is φ = 220999104.

The previous prime is 397492189. The next prime is 397492243. The reversal of 397492221 is 122294793.

It is not a de Polignac number, because 397492221 - 2⁵ = 397492189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397492221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397492021) 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, 255010 + ... + 256563.

It is an arithmetic number, because the mean of its divisors is an integer number (38879624).

Almost surely, 2^397492221 is an apocalyptic number.

It is an amenable number.

397492221 is a deficient number, since it is larger than the sum of its proper divisors (224581763).

397492221 is a wasteful number, since it uses less digits than its factorization.

397492221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511620.

The product of its digits is 54432, while the sum is 39.

The square root of 397492221 is about 19937.2069508244. The cubic root of 397492221 is about 735.2632811254.

The spelling of 397492221 in words is "three hundred ninety-seven million, four hundred ninety-two thousand, two hundred twenty-one".