18042844 has 6 divisors (see below), whose sum is σ = 31574984. Its totient is φ = 9021420.

The previous prime is 18042841. The next prime is 18042859. The reversal of 18042844 is 44824081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18042841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255352 + ... + 2255359.

Almost surely, 2^18042844 is an apocalyptic number.

It is an amenable number.

18042844 is a deficient number, since it is larger than the sum of its proper divisors (13532140).

18042844 is a wasteful number, since it uses less digits than its factorization.

18042844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510715 (or 4510713 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 18042844 is about 4247.6868999492. The cubic root of 18042844 is about 262.2819062278.

Adding to 18042844 its product of nonzero digits (8192), we get a triangular number (18051036 = T₆₀₀₈).

The spelling of 18042844 in words is "eighteen million, forty-two thousand, eight hundred forty-four".