18042424 has 8 divisors (see below), whose sum is σ = 33829560. Its totient is φ = 9021208.

The previous prime is 18042361. The next prime is 18042463. The reversal of 18042424 is 42424081.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1127644 + ... + 1127659.

It is an arithmetic number, because the mean of its divisors is an integer number (4228695).

Almost surely, 2^18042424 is an apocalyptic number.

It is an amenable number.

18042424 is a deficient number, since it is larger than the sum of its proper divisors (15787136).

18042424 is a wasteful number, since it uses less digits than its factorization.

18042424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255309 (or 2255305 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 18042424 is about 4247.6374609893. The cubic root of 18042424 is about 262.2798710856.

The spelling of 18042424 in words is "eighteen million, forty-two thousand, four hundred twenty-four".