999698939 has 2 divisors, whose sum is σ = 999698940. Its totient is φ = 999698938.

The previous prime is 999698929. The next prime is 999698963. The reversal of 999698939 is 939896999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999698939 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (999698929) 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, 499849469 + 499849470.

It is an arithmetic number, because the mean of its divisors is an integer number (499849470).

Almost surely, 2^999698939 is an apocalyptic number.

999698939 is a deficient number, since it is larger than the sum of its proper divisors (1).

999698939 is an equidigital number, since it uses as much as digits as its factorization.

999698939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76527504, while the sum is 71.

The square root of 999698939 is about 31618.0160509795. The cubic root of 999698939 is about 999.8996362608.

The spelling of 999698939 in words is "nine hundred ninety-nine million, six hundred ninety-eight thousand, nine hundred thirty-nine".