166397946 has 32 divisors (see below), whose sum is σ = 390979008. Its totient is φ = 46544640.

The previous prime is 166397909. The next prime is 166397981. The reversal of 166397946 is 649793661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96111 + ... + 97826.

It is an arithmetic number, because the mean of its divisors is an integer number (12218094).

Almost surely, 2^166397946 is an apocalyptic number.

166397946 is an abundant number, since it is smaller than the sum of its proper divisors (224581062).

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

166397946 is a wasteful number, since it uses less digits than its factorization.

166397946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193966.

The product of its digits is 1469664, while the sum is 51.

The square root of 166397946 is about 12899.5327822367. The cubic root of 166397946 is about 550.0252836862.

The spelling of 166397946 in words is "one hundred sixty-six million, three hundred ninety-seven thousand, nine hundred forty-six".