1816898 has 4 divisors (see below), whose sum is σ = 2725350. Its totient is φ = 908448.

The previous prime is 1816861. The next prime is 1816901. The reversal of 1816898 is 8986181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8986181 = 107 ⋅83983.

It can be written as a sum of positive squares in only one way, i.e., 1682209 + 134689 = 1297^2 + 367^2 .

It is a super-2 number, since 2×1816898² = 6602236684808, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454223 + ... + 454226.

2^1816898 is an apocalyptic number.

1816898 is a deficient number, since it is larger than the sum of its proper divisors (908452).

1816898 is an equidigital number, since it uses as much as digits as its factorization.

1816898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908451.

The product of its digits is 27648, while the sum is 41.

The square root of 1816898 is about 1347.9235883387. The cubic root of 1816898 is about 122.0235106531.

The spelling of 1816898 in words is "one million, eight hundred sixteen thousand, eight hundred ninety-eight".