398166226 has 4 divisors (see below), whose sum is σ = 597249342. Its totient is φ = 199083112.

The previous prime is 398166217. The next prime is 398166227. The reversal of 398166226 is 622661893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622661893 = 7 ⋅88951699.

It can be written as a sum of positive squares in only one way, i.e., 396209025 + 1957201 = 19905^2 + 1399^2 .

It is not an unprimeable number, because it can be changed into a prime (398166227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99541555 + ... + 99541558.

Almost surely, 2^398166226 is an apocalyptic number.

398166226 is a deficient number, since it is larger than the sum of its proper divisors (199083116).

398166226 is a wasteful number, since it uses less digits than its factorization.

398166226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199083115.

The product of its digits is 186624, while the sum is 43.

The square root of 398166226 is about 19954.1029866040. The cubic root of 398166226 is about 735.6786278594.

It can be divided in two parts, 3981 and 66226, that added together give a palindrome (70207).

The spelling of 398166226 in words is "three hundred ninety-eight million, one hundred sixty-six thousand, two hundred twenty-six".