999956939 has 2 divisors, whose sum is σ = 999956940. Its totient is φ = 999956938.

The previous prime is 999956933. The next prime is 999956963. The reversal of 999956939 is 939659999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999956939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999956933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499978469 + 499978470.

It is an arithmetic number, because the mean of its divisors is an integer number (499978470).

Almost surely, 2^999956939 is an apocalyptic number.

999956939 is a deficient number, since it is larger than the sum of its proper divisors (1).

999956939 is an equidigital number, since it uses as much as digits as its factorization.

999956939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47829690, while the sum is 68.

The square root of 999956939 is about 31622.0957401624. The cubic root of 999956939 is about 999.9856461273.

The spelling of 999956939 in words is "nine hundred ninety-nine million, nine hundred fifty-six thousand, nine hundred thirty-nine".