18785842 has 4 divisors (see below), whose sum is σ = 28178766. Its totient is φ = 9392920.

The previous prime is 18785807. The next prime is 18785849. The reversal of 18785842 is 24858781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24858781 = 61 ⋅407521.

It can be written as a sum of positive squares in only one way, i.e., 11758041 + 7027801 = 3429^2 + 2651^2 .

It is not an unprimeable number, because it can be changed into a prime (18785849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4696459 + ... + 4696462.

Almost surely, 2^18785842 is an apocalyptic number.

18785842 is a deficient number, since it is larger than the sum of its proper divisors (9392924).

18785842 is an equidigital number, since it uses as much as digits as its factorization.

18785842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9392923.

The product of its digits is 143360, while the sum is 43.

The square root of 18785842 is about 4334.2637206335. The cubic root of 18785842 is about 265.8338136955.

The spelling of 18785842 in words is "eighteen million, seven hundred eighty-five thousand, eight hundred forty-two".