398172066 has 16 divisors (see below), whose sum is σ = 800388864. Its totient is φ = 132049904.

The previous prime is 398172053. The next prime is 398172083. The reversal of 398172066 is 660271893.

It is a happy number.

It is an unprimeable number.

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, 167250 + ... + 169613.

It is an arithmetic number, because the mean of its divisors is an integer number (50024304).

Almost surely, 2^398172066 is an apocalyptic number.

398172066 is an abundant number, since it is smaller than the sum of its proper divisors (402216798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398172066 is a wasteful number, since it uses less digits than its factorization.

398172066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337065.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 398172066 is about 19954.2493218863. The cubic root of 398172066 is about 735.6822246338.

The spelling of 398172066 in words is "three hundred ninety-eight million, one hundred seventy-two thousand, sixty-six".