1998623059 has 2 divisors, whose sum is σ = 1998623060. Its totient is φ = 1998623058.

The previous prime is 1998623051. The next prime is 1998623153. The reversal of 1998623059 is 9503268991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998623059 - 2³ = 1998623051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1998622997 and 1998623015.

It is not a weakly prime, because it can be changed into another prime (1998623051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999311529 + 999311530.

It is an arithmetic number, because the mean of its divisors is an integer number (999311530).

Almost surely, 2^1998623059 is an apocalyptic number.

1998623059 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998623059 is an equidigital number, since it uses as much as digits as its factorization.

1998623059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 1998623059 is about 44705.9622310045. The cubic root of 1998623059 is about 1259.6318440231.

The spelling of 1998623059 in words is "one billion, nine hundred ninety-eight million, six hundred twenty-three thousand, fifty-nine".