1918810918 has 4 divisors (see below), whose sum is σ = 2878216380. Its totient is φ = 959405458.

The previous prime is 1918810889. The next prime is 1918810939. The reversal of 1918810918 is 8190188191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8190188191 = 59 ⋅138816749.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 479702728 + ... + 479702731.

It is an arithmetic number, because the mean of its divisors is an integer number (719554095).

Almost surely, 2^1918810918 is an apocalyptic number.

1918810918 is a deficient number, since it is larger than the sum of its proper divisors (959405462).

1918810918 is an equidigital number, since it uses as much as digits as its factorization.

1918810918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959405461.

The product of its (nonzero) digits is 41472, while the sum is 46.

The square root of 1918810918 is about 43804.2340190991. The cubic root of 1918810918 is about 1242.6363692397.

The spelling of 1918810918 in words is "one billion, nine hundred eighteen million, eight hundred ten thousand, nine hundred eighteen".