1598399987 has 2 divisors, whose sum is σ = 1598399988. Its totient is φ = 1598399986.

The previous prime is 1598399983. The next prime is 1598400007. The reversal of 1598399987 is 7899938951.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1598399987 - 2² = 1598399983 is a prime.

It is not a weakly prime, because it can be changed into another prime (1598399981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 799199993 + 799199994.

It is an arithmetic number, because the mean of its divisors is an integer number (799199994).

Almost surely, 2^1598399987 is an apocalyptic number.

1598399987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1598399987 is an equidigital number, since it uses as much as digits as its factorization.

1598399987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44089920, while the sum is 68.

The square root of 1598399987 is about 39979.9948349171. The cubic root of 1598399987 is about 1169.2170930550.

The spelling of 1598399987 in words is "one billion, five hundred ninety-eight million, three hundred ninety-nine thousand, nine hundred eighty-seven".