1898818 has 4 divisors (see below), whose sum is σ = 2848230. Its totient is φ = 949408.

The previous prime is 1898807. The next prime is 1898861. The reversal of 1898818 is 8188981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8188981 = 19 ⋅430999.

It can be written as a sum of positive squares in only one way, i.e., 1885129 + 13689 = 1373^2 + 117^2 .

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, 474703 + ... + 474706.

2^1898818 is an apocalyptic number.

1898818 is a deficient number, since it is larger than the sum of its proper divisors (949412).

1898818 is an equidigital number, since it uses as much as digits as its factorization.

1898818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949411.

The product of its digits is 36864, while the sum is 43.

The square root of 1898818 is about 1377.9760520415. The cubic root of 1898818 is about 123.8305437637.

The spelling of 1898818 in words is "one million, eight hundred ninety-eight thousand, eight hundred eighteen".