18667842 has 16 divisors (see below), whose sum is σ = 39300960. Its totient is φ = 5895072.

The previous prime is 18667837. The next prime is 18667849. The reversal of 18667842 is 24876681.

It is a junction number, because it is equal to n+sod(n) for n = 18667794 and 18667803.

It is not an unprimeable number, because it can be changed into a prime (18667849) by changing a digit.

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, 81763 + ... + 81990.

It is an arithmetic number, because the mean of its divisors is an integer number (2456310).

Almost surely, 2^18667842 is an apocalyptic number.

18667842 is an abundant number, since it is smaller than the sum of its proper divisors (20633118).

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

18667842 is a wasteful number, since it uses less digits than its factorization.

18667842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163777.

The product of its digits is 129024, while the sum is 42.

The square root of 18667842 is about 4320.6298152006. The cubic root of 18667842 is about 265.2760479317.

The spelling of 18667842 in words is "eighteen million, six hundred sixty-seven thousand, eight hundred forty-two".