999698 has 18 divisors (see below), whose sum is σ = 1761813. Its totient is φ = 424200.

The previous prime is 999683. The next prime is 999721. The reversal of 999698 is 896999.

It can be written as a sum of positive squares in 2 ways, for example, as 693889 + 305809 = 833^2 + 553^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=707.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999698.

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, 9848 + ... + 9948.

2⁹⁹⁹⁶⁹⁸ is an apocalyptic number.

999698 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

999698 is a deficient number, since it is larger than the sum of its proper divisors (762115).

999698 is a wasteful number, since it uses less digits than its factorization.

999698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 110 counting only the distinct ones).

The product of its digits is 314928, while the sum is 50.

The square root of 999698 is about 999.8489885978. The cubic root of 999698 is about 99.9899323198.

Multiplying 999698 by its sum of digits (50), we get a square (49984900 = 7070²).

The spelling of 999698 in words is "nine hundred ninety-nine thousand, six hundred ninety-eight".