166836138 has 32 divisors (see below), whose sum is σ = 384725376. Its totient is φ = 47244288.

The previous prime is 166836127. The next prime is 166836151. The reversal of 166836138 is 831638661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 166836138.

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, 12831 + ... + 22322.

It is an arithmetic number, because the mean of its divisors is an integer number (12022668).

Almost surely, 2^166836138 is an apocalyptic number.

166836138 is an abundant number, since it is smaller than the sum of its proper divisors (217889238).

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

166836138 is a wasteful number, since it uses less digits than its factorization.

166836138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35278.

The product of its digits is 124416, while the sum is 42.

The square root of 166836138 is about 12916.5064162102. The cubic root of 166836138 is about 550.5076723005.

The spelling of 166836138 in words is "one hundred sixty-six million, eight hundred thirty-six thousand, one hundred thirty-eight".