18042838 has 8 divisors (see below), whose sum is σ = 29524680. Its totient is φ = 8201280.

The previous prime is 18042809. The next prime is 18042841. The reversal of 18042838 is 83824081.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410043 + ... + 410086.

It is an arithmetic number, because the mean of its divisors is an integer number (3690585).

Almost surely, 2^18042838 is an apocalyptic number.

18042838 is a deficient number, since it is larger than the sum of its proper divisors (11481842).

18042838 is a wasteful number, since it uses less digits than its factorization.

18042838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820142.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 18042838 is about 4247.6861936824. The cubic root of 18042838 is about 262.2818771545.

The spelling of 18042838 in words is "eighteen million, forty-two thousand, eight hundred thirty-eight".