189459979 has 2 divisors, whose sum is σ = 189459980. Its totient is φ = 189459978.

The previous prime is 189459937. The next prime is 189459983. The reversal of 189459979 is 979954981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189459979 is a prime.

It is not a weakly prime, because it can be changed into another prime (189459079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94729989 + 94729990.

It is an arithmetic number, because the mean of its divisors is an integer number (94729990).

Almost surely, 2^189459979 is an apocalyptic number.

189459979 is a deficient number, since it is larger than the sum of its proper divisors (1).

189459979 is an equidigital number, since it uses as much as digits as its factorization.

189459979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 61.

The square root of 189459979 is about 13764.4461930003. The cubic root of 189459979 is about 574.3445375355.

The spelling of 189459979 in words is "one hundred eighty-nine million, four hundred fifty-nine thousand, nine hundred seventy-nine".