189896977 has 2 divisors, whose sum is σ = 189896978. Its totient is φ = 189896976.

The previous prime is 189896969. The next prime is 189896989. The reversal of 189896977 is 779698981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184117761 + 5779216 = 13569^2 + 2404^2 .

It is a cyclic number.

It is not a de Polignac number, because 189896977 - 2³ = 189896969 is a prime.

It is not a weakly prime, because it can be changed into another prime (189896957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94948488 + 94948489.

It is an arithmetic number, because the mean of its divisors is an integer number (94948489).

Almost surely, 2^189896977 is an apocalyptic number.

It is an amenable number.

189896977 is a deficient number, since it is larger than the sum of its proper divisors (1).

189896977 is an equidigital number, since it uses as much as digits as its factorization.

189896977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 64.

The square root of 189896977 is about 13780.3112083871. The cubic root of 189896977 is about 574.7857823324.

The spelling of 189896977 in words is "one hundred eighty-nine million, eight hundred ninety-six thousand, nine hundred seventy-seven".