18405842 has 32 divisors (see below), whose sum is σ = 35465472. Its totient is φ = 6963264.

The previous prime is 18405839. The next prime is 18405853. The reversal of 18405842 is 24850481.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18405799 and 18405808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1988 + ... + 6384.

It is an arithmetic number, because the mean of its divisors is an integer number (1108296).

Almost surely, 2^18405842 is an apocalyptic number.

18405842 is a deficient number, since it is larger than the sum of its proper divisors (17059630).

18405842 is a wasteful number, since it uses less digits than its factorization.

18405842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 18405842 is about 4290.2030254989. The cubic root of 18405842 is about 264.0291615323.

The spelling of 18405842 in words is "eighteen million, four hundred five thousand, eight hundred forty-two".