1099998 has 24 divisors (see below), whose sum is σ = 2487888. Its totient is φ = 350592.

The previous prime is 1099997. The next prime is 1100009. The reversal of 1099998 is 8999901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 915 + ... + 1742.

It is an arithmetic number, because the mean of its divisors is an integer number (103662).

2^1099998 is an apocalyptic number.

1099998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1099998 is an abundant number, since it is smaller than the sum of its proper divisors (1387890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1099998 is a wasteful number, since it uses less digits than its factorization.

1099998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688 (or 2685 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 1099998 is about 1048.8078947071. The cubic root of 1099998 is about 103.2279489832.

The spelling of 1099998 in words is "one million, ninety-nine thousand, nine hundred ninety-eight".