166389380 has 24 divisors (see below), whose sum is σ = 350289240. Its totient is φ = 66389760.

The previous prime is 166389367. The next prime is 166389389. The reversal of 166389380 is 83983661.

166389380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 57729604 + 108659776 = 7598^2 + 10424^2 .

It is not an unprimeable number, because it can be changed into a prime (166389389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1991 + ... + 18350.

It is an arithmetic number, because the mean of its divisors is an integer number (14595385).

Almost surely, 2^166389380 is an apocalyptic number.

166389380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166389380 is an abundant number, since it is smaller than the sum of its proper divisors (183899860).

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

166389380 is a wasteful number, since it uses less digits than its factorization.

166389380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20759 (or 20757 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 166389380 is about 12899.2007504341. The cubic root of 166389380 is about 550.0158452735.

The spelling of 166389380 in words is "one hundred sixty-six million, three hundred eighty-nine thousand, three hundred eighty".