397666226 has 16 divisors (see below), whose sum is σ = 604632600. Its totient is φ = 196138368.

The previous prime is 397666177. The next prime is 397666229. The reversal of 397666226 is 622666793.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 248850625 + 148815601 = 15775^2 + 12199^2 .

It is not an unprimeable number, because it can be changed into a prime (397666229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46880 + ... + 54708.

Almost surely, 2^397666226 is an apocalyptic number.

397666226 is a deficient number, since it is larger than the sum of its proper divisors (206966374).

397666226 is a wasteful number, since it uses less digits than its factorization.

397666226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8173.

The product of its digits is 979776, while the sum is 47.

The square root of 397666226 is about 19941.5702992518. The cubic root of 397666226 is about 735.3705543551.

The spelling of 397666226 in words is "three hundred ninety-seven million, six hundred sixty-six thousand, two hundred twenty-six".