192979987 has 2 divisors, whose sum is σ = 192979988. Its totient is φ = 192979986.

The previous prime is 192979939. The next prime is 192980009. The reversal of 192979987 is 789979291.

It is a strong prime.

It is an emirp because it is prime and its reverse (789979291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 192979987 - 2⁷ = 192979859 is a prime.

It is not a weakly prime, because it can be changed into another prime (192977987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96489993 + 96489994.

It is an arithmetic number, because the mean of its divisors is an integer number (96489994).

Almost surely, 2^192979987 is an apocalyptic number.

192979987 is a deficient number, since it is larger than the sum of its proper divisors (1).

192979987 is an equidigital number, since it uses as much as digits as its factorization.

192979987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 61.

The square root of 192979987 is about 13891.7236871455. The cubic root of 192979987 is about 577.8796808579.

The spelling of 192979987 in words is "one hundred ninety-two million, nine hundred seventy-nine thousand, nine hundred eighty-seven".