999670898 has 18 divisors (see below), whose sum is σ = 1524113199.
Its totient is φ = 491764572.
The previous prime is 999670877. The next prime is 999670943. The reversal of 999670898 is 898076999.
It can be written as a sum of positive squares in only one way, i.e., 499835449 + 499835449 = 22357^2 + 22357^2
It is an ABA number since it can be written as A⋅BA, here for A=2, B=22357.
It is a Duffinian number.
It is an unprimeable number.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3532265 + ... + 3532547.
Almost surely, 2999670898 is an apocalyptic number.
999670898 is a deficient number, since it is larger than the sum of its proper divisors (524442301).
999670898 is an frugal number, since it uses more digits than its factorization.
999670898 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 726 (or 364 counting only the distinct ones).
The product of its (nonzero) digits is 17635968, while the sum is 65.
The square root of 999670898 is about 31617.5726139753.
The cubic root of 999670898 is about 999.8902872969.
The spelling of 999670898 in words is "nine hundred ninety-nine million, six hundred seventy thousand, eight hundred ninety-eight".