Multipling 999698 by its sum of digits (50), we get a square (49984900 = 70702).
It is an ABA number since it can be written as A⋅BA, 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.
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 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 square root of 999698 is about 999.8489885978. The cubic root of 999698 is about 99.9899323198.
The spelling of 999698 in words is "nine hundred ninety-nine thousand, six hundred ninety-eight".