179966989 has 4 divisors (see below), whose sum is σ = 181989180. Its totient is φ = 177944800.

The previous prime is 179966987. The next prime is 179967023. The reversal of 179966989 is 989669971.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9455625 + 170511364 = 3075^2 + 13058^2 .

It is a cyclic number.

It is not a de Polignac number, because 179966989 - 2¹ = 179966987 is a prime.

It is a super-2 number, since 2×179966989² = 64776234259452242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 179966989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (179966987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010962 + ... + 1011139.

It is an arithmetic number, because the mean of its divisors is an integer number (45497295).

Almost surely, 2^179966989 is an apocalyptic number.

It is an amenable number.

179966989 is a deficient number, since it is larger than the sum of its proper divisors (2022191).

179966989 is an equidigital number, since it uses as much as digits as its factorization.

179966989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022190.

The product of its digits is 13226976, while the sum is 64.

The square root of 179966989 is about 13415.1775612550. The cubic root of 179966989 is about 564.5870990624.

The spelling of 179966989 in words is "one hundred seventy-nine million, nine hundred sixty-six thousand, nine hundred eighty-nine".