189651979 has 8 divisors (see below), whose sum is σ = 207443520. Its totient is φ = 171952200.

The previous prime is 189651971. The next prime is 189651991. The reversal of 189651979 is 979156981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189651979 - 2³ = 189651971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189651971) 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, 18577 + ... + 26914.

It is an arithmetic number, because the mean of its divisors is an integer number (25930440).

Almost surely, 2^189651979 is an apocalyptic number.

189651979 is a deficient number, since it is larger than the sum of its proper divisors (17791541).

189651979 is a wasteful number, since it uses less digits than its factorization.

189651979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45881.

The product of its digits is 1224720, while the sum is 55.

The square root of 189651979 is about 13771.4189174536. The cubic root of 189651979 is about 574.5384868890.

The spelling of 189651979 in words is "one hundred eighty-nine million, six hundred fifty-one thousand, nine hundred seventy-nine".