999359939 has 2 divisors, whose sum is σ = 999359940. Its totient is φ = 999359938.

The previous prime is 999359857. The next prime is 999359957. The reversal of 999359939 is 939953999.

It is a strong prime.

It is an emirp because it is prime and its reverse (939953999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999359939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999359639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499679969 + 499679970.

It is an arithmetic number, because the mean of its divisors is an integer number (499679970).

Almost surely, 2^999359939 is an apocalyptic number.

999359939 is a deficient number, since it is larger than the sum of its proper divisors (1).

999359939 is an equidigital number, since it uses as much as digits as its factorization.

999359939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23914845, while the sum is 65.

The square root of 999359939 is about 31612.6547287633. The cubic root of 999359939 is about 999.7866007974.

The spelling of 999359939 in words is "nine hundred ninety-nine million, three hundred fifty-nine thousand, nine hundred thirty-nine".