1009998 has 24 divisors (see below), whose sum is σ = 2387736. Its totient is φ = 306000.

The previous prime is 1009997. The next prime is 1010003. The reversal of 1009998 is 8999001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009991) 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, 2353 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (99489).

2^1009998 is an apocalyptic number.

1009998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1009998 is an abundant number, since it is smaller than the sum of its proper divisors (1377738).

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

1009998 is a wasteful number, since it uses less digits than its factorization.

1009998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120 (or 5117 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1009998 is about 1004.9865670744. The cubic root of 1009998 is about 100.3321621283.

The spelling of 1009998 in words is "one million, nine thousand, nine hundred ninety-eight".