189906979 has 2 divisors, whose sum is σ = 189906980. Its totient is φ = 189906978.

The previous prime is 189906973. The next prime is 189906989. The reversal of 189906979 is 979609981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189906979 - 2¹⁵ = 189874211 is a prime.

It is not a weakly prime, because it can be changed into another prime (189906973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94953489 + 94953490.

It is an arithmetic number, because the mean of its divisors is an integer number (94953490).

Almost surely, 2^189906979 is an apocalyptic number.

189906979 is a deficient number, since it is larger than the sum of its proper divisors (1).

189906979 is an equidigital number, since it uses as much as digits as its factorization.

189906979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The square root of 189906979 is about 13780.6741126840. The cubic root of 189906979 is about 574.7958736050.

The spelling of 189906979 in words is "one hundred eighty-nine million, nine hundred six thousand, nine hundred seventy-nine".