18642838 has 16 divisors (see below), whose sum is σ = 29675520. Its totient is φ = 8759016.

The previous prime is 18642809. The next prime is 18642839. The reversal of 18642838 is 83824681.

It is a self number, because there is not a number n which added to its sum of digits gives 18642838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18642839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2895 + ... + 6757.

It is an arithmetic number, because the mean of its divisors is an integer number (1854720).

Almost surely, 2^18642838 is an apocalyptic number.

18642838 is a deficient number, since it is larger than the sum of its proper divisors (11032682).

18642838 is a wasteful number, since it uses less digits than its factorization.

18642838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its digits is 73728, while the sum is 40.

The square root of 18642838 is about 4317.7352860035. The cubic root of 18642838 is about 265.1575567149.

The spelling of 18642838 in words is "eighteen million, six hundred forty-two thousand, eight hundred thirty-eight".