189377989 has 2 divisors, whose sum is σ = 189377990. Its totient is φ = 189377988.

The previous prime is 189377971. The next prime is 189378053. The reversal of 189377989 is 989773981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111197025 + 78180964 = 10545^2 + 8842^2 .

It is a cyclic number.

It is not a de Polignac number, because 189377989 - 2⁷ = 189377861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189377939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94688994 + 94688995.

It is an arithmetic number, because the mean of its divisors is an integer number (94688995).

Almost surely, 2^189377989 is an apocalyptic number.

It is an amenable number.

189377989 is a deficient number, since it is larger than the sum of its proper divisors (1).

189377989 is an equidigital number, since it uses as much as digits as its factorization.

189377989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 61.

The square root of 189377989 is about 13761.4675452875. The cubic root of 189377989 is about 574.2616751752.

The spelling of 189377989 in words is "one hundred eighty-nine million, three hundred seventy-seven thousand, nine hundred eighty-nine".