18081842 has 8 divisors (see below), whose sum is σ = 27261036. Its totient is φ = 8994832.

The previous prime is 18081821. The next prime is 18081853. The reversal of 18081842 is 24818081.

It can be written as a sum of positive squares in 2 ways, for example, as 17631601 + 450241 = 4199^2 + 671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18081842² = 653906020225928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18081799 and 18081808.

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 3 ways as a sum of consecutive naturals, for example, 22553 + ... + 23340.

Almost surely, 2^18081842 is an apocalyptic number.

18081842 is a deficient number, since it is larger than the sum of its proper divisors (9179194).

18081842 is a wasteful number, since it uses less digits than its factorization.

18081842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46092.

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 18081842 is about 4252.2749205572. The cubic root of 18081842 is about 262.4707365716.

The spelling of 18081842 in words is "eighteen million, eighty-one thousand, eight hundred forty-two".