1819998 has 12 divisors (see below), whose sum is σ = 3943368. Its totient is φ = 606660.

The previous prime is 1819957. The next prime is 1819999. The reversal of 1819998 is 8999181.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1819999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50538 + ... + 50573.

It is an arithmetic number, because the mean of its divisors is an integer number (328614).

2^1819998 is an apocalyptic number.

1819998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1819998 is an abundant number, since it is smaller than the sum of its proper divisors (2123370).

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

1819998 is a wasteful number, since it uses less digits than its factorization.

1819998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101119 (or 101116 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 1819998 is about 1349.0730150737. The cubic root of 1819998 is about 122.0928702520.

The spelling of 1819998 in words is "one million, eight hundred nineteen thousand, nine hundred ninety-eight".