1918198 has 4 divisors (see below), whose sum is σ = 2877300. Its totient is φ = 959098.

The previous prime is 1918193. The next prime is 1918219. The reversal of 1918198 is 8918191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8918191 = 73 ⋅122167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 479548 + ... + 479551.

It is an arithmetic number, because the mean of its divisors is an integer number (719325).

2^1918198 is an apocalyptic number.

1918198 is a deficient number, since it is larger than the sum of its proper divisors (959102).

1918198 is an equidigital number, since it uses as much as digits as its factorization.

1918198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959101.

The product of its digits is 5184, while the sum is 37.

The square root of 1918198 is about 1384.9902526733. The cubic root of 1918198 is about 124.2504045049.

It can be divided in two parts, 1918 and 198, that added together give a square (2116 = 46²).

The spelling of 1918198 in words is "one million, nine hundred eighteen thousand, one hundred ninety-eight".