18865942 has 4 divisors (see below), whose sum is σ = 28298916. Its totient is φ = 9432970.

The previous prime is 18865939. The next prime is 18865961. The reversal of 18865942 is 24956881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24956881 = 3947 ⋅6323.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4716484 + ... + 4716487.

It is an arithmetic number, because the mean of its divisors is an integer number (7074729).

Almost surely, 2^18865942 is an apocalyptic number.

18865942 is a deficient number, since it is larger than the sum of its proper divisors (9432974).

18865942 is an equidigital number, since it uses as much as digits as its factorization.

18865942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432973.

The product of its digits is 138240, while the sum is 43.

The square root of 18865942 is about 4343.4942154906. The cubic root of 18865942 is about 266.2111030778.

The spelling of 18865942 in words is "eighteen million, eight hundred sixty-five thousand, nine hundred forty-two".