18397842 has 16 divisors (see below), whose sum is σ = 38960352. Its totient is φ = 5771840.

The previous prime is 18397829. The next prime is 18397853. The reversal of 18397842 is 24879381.

It is a junction number, because it is equal to n+sod(n) for n = 18397794 and 18397803.

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 in 7 ways as a sum of consecutive naturals, for example, 90084 + ... + 90287.

It is an arithmetic number, because the mean of its divisors is an integer number (2435022).

Almost surely, 2^18397842 is an apocalyptic number.

18397842 is an abundant number, since it is smaller than the sum of its proper divisors (20562510).

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

18397842 is a wasteful number, since it uses less digits than its factorization.

18397842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180393.

The product of its digits is 96768, while the sum is 42.

The square root of 18397842 is about 4289.2705673576. The cubic root of 18397842 is about 263.9909030382.

The spelling of 18397842 in words is "eighteen million, three hundred ninety-seven thousand, eight hundred forty-two".