899787979 has 2 divisors, whose sum is σ = 899787980. Its totient is φ = 899787978.

The previous prime is 899787971. The next prime is 899788013. The reversal of 899787979 is 979787998.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 899787979 - 2³ = 899787971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (899787971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449893989 + 449893990.

It is an arithmetic number, because the mean of its divisors is an integer number (449893990).

Almost surely, 2^899787979 is an apocalyptic number.

899787979 is a deficient number, since it is larger than the sum of its proper divisors (1).

899787979 is an equidigital number, since it uses as much as digits as its factorization.

899787979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144027072, while the sum is 73.

The square root of 899787979 is about 29996.4661085269. The cubic root of 899787979 is about 965.4135623458.

The spelling of 899787979 in words is "eight hundred ninety-nine million, seven hundred eighty-seven thousand, nine hundred seventy-nine".