999797997 has 64 divisors (see below), whose sum is σ = 1564738560. Its totient is φ = 562060800.

The previous prime is 999797987. The next prime is 999798001. The reversal of 999797997 is 799797999.

It is not a de Polignac number, because 999797997 - 2⁶ = 999797933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999797927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3256518 + ... + 3256824.

It is an arithmetic number, because the mean of its divisors is an integer number (24449040).

Almost surely, 2^999797997 is an apocalyptic number.

It is an amenable number.

999797997 is a deficient number, since it is larger than the sum of its proper divisors (564940563).

999797997 is a wasteful number, since it uses less digits than its factorization.

999797997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474.

The product of its digits is 182284263, while the sum is 75.

The square root of 999797997 is about 31619.5824924998. The cubic root of 999797997 is about 999.9326611322.

The spelling of 999797997 in words is "nine hundred ninety-nine million, seven hundred ninety-seven thousand, nine hundred ninety-seven".