1811898 has 24 divisors (see below), whose sum is σ = 4283136. Its totient is φ = 549000.

The previous prime is 1811893. The next prime is 1811899. The reversal of 1811898 is 8981181.

It is not an unprimeable number, because it can be changed into a prime (1811893) 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 11 ways as a sum of consecutive naturals, for example, 4378 + ... + 4773.

It is an arithmetic number, because the mean of its divisors is an integer number (178464).

2^1811898 is an apocalyptic number.

1811898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1811898 is an abundant number, since it is smaller than the sum of its proper divisors (2471238).

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

1811898 is a wasteful number, since it uses less digits than its factorization.

1811898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9170 (or 9167 counting only the distinct ones).

The product of its digits is 4608, while the sum is 36.

The square root of 1811898 is about 1346.0676060288. The cubic root of 1811898 is about 121.9114738959.

The spelling of 1811898 in words is "one million, eight hundred eleven thousand, eight hundred ninety-eight".