999670897 has 8 divisors (see below), whose sum is σ = 1024704072. Its totient is φ = 974668800.

The previous prime is 999670877. The next prime is 999670943. The reversal of 999670897 is 798076999.

It can be written as a sum of positive squares in 4 ways, for example, as 1679616 + 997991281 = 1296^2 + 31591^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999670897 - 2²³ = 991282289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999670817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65997 + ... + 79717.

It is an arithmetic number, because the mean of its divisors is an integer number (128088009).

Almost surely, 2^999670897 is an apocalyptic number.

It is an amenable number.

999670897 is a deficient number, since it is larger than the sum of its proper divisors (25033175).

999670897 is a wasteful number, since it uses less digits than its factorization.

999670897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15539.

The product of its (nonzero) digits is 15431472, while the sum is 64.

The square root of 999670897 is about 31617.5725981613. The cubic root of 999670897 is about 999.8902869635.

The spelling of 999670897 in words is "nine hundred ninety-nine million, six hundred seventy thousand, eight hundred ninety-seven".