642383999 has 2 divisors, whose sum is σ = 642384000. Its totient is φ = 642383998.

The previous prime is 642383983. The next prime is 642384011. The reversal of 642383999 is 999383246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642383999 - 2⁴ = 642383983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642383999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642313999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321191999 + 321192000.

It is an arithmetic number, because the mean of its divisors is an integer number (321192000).

Almost surely, 2^642383999 is an apocalyptic number.

642383999 is a deficient number, since it is larger than the sum of its proper divisors (1).

642383999 is an equidigital number, since it uses as much as digits as its factorization.

642383999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 53.

The square root of 642383999 is about 25345.2954017111. The cubic root of 642383999 is about 862.8425855759.

The spelling of 642383999 in words is "six hundred forty-two million, three hundred eighty-three thousand, nine hundred ninety-nine".