999855007 has 2 divisors, whose sum is σ = 999855008. Its totient is φ = 999855006.

The previous prime is 999855001. The next prime is 999855019. The reversal of 999855007 is 700558999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999855007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999855001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499927503 + 499927504.

It is an arithmetic number, because the mean of its divisors is an integer number (499927504).

Almost surely, 2^999855007 is an apocalyptic number.

999855007 is a deficient number, since it is larger than the sum of its proper divisors (1).

999855007 is an equidigital number, since it uses as much as digits as its factorization.

999855007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The square root of 999855007 is about 31620.4839779533. The cubic root of 999855007 is about 999.9516666639.

The spelling of 999855007 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, seven".