1999230979 has 2 divisors, whose sum is σ = 1999230980. Its totient is φ = 1999230978.

The previous prime is 1999230943. The next prime is 1999231051. The reversal of 1999230979 is 9790329991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1999230979 - 2¹³ = 1999222787 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999237979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999615489 + 999615490.

It is an arithmetic number, because the mean of its divisors is an integer number (999615490).

Almost surely, 2^1999230979 is an apocalyptic number.

1999230979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999230979 is an equidigital number, since it uses as much as digits as its factorization.

1999230979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2480058, while the sum is 58.

The square root of 1999230979 is about 44712.7608071790. The cubic root of 1999230979 is about 1259.7595449020.

The spelling of 1999230979 in words is "one billion, nine hundred ninety-nine million, two hundred thirty thousand, nine hundred seventy-nine".