18811842 has 16 divisors (see below), whose sum is σ = 42998592. Its totient is φ = 5374800.

The previous prime is 18811831. The next prime is 18811879. The reversal of 18811842 is 24811881.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223909 + ... + 223992.

It is an arithmetic number, because the mean of its divisors is an integer number (2687412).

Almost surely, 2^18811842 is an apocalyptic number.

18811842 is an abundant number, since it is smaller than the sum of its proper divisors (24186750).

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

18811842 is a wasteful number, since it uses less digits than its factorization.

18811842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447913.

The product of its digits is 4096, while the sum is 33.

The square root of 18811842 is about 4337.2620395821. The cubic root of 18811842 is about 265.9563970213.

The spelling of 18811842 in words is "eighteen million, eight hundred eleven thousand, eight hundred forty-two".