18727842 has 32 divisors (see below), whose sum is σ = 44669952. Its totient is φ = 5117904.

The previous prime is 18727783. The next prime is 18727843. The reversal of 18727842 is 24872781.

It is a self number, because there is not a number n which added to its sum of digits gives 18727842.

It is not an unprimeable number, because it can be changed into a prime (18727843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8728 + ... + 10659.

It is an arithmetic number, because the mean of its divisors is an integer number (1395936).

Almost surely, 2^18727842 is an apocalyptic number.

18727842 is an abundant number, since it is smaller than the sum of its proper divisors (25942110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18727842 is a wasteful number, since it uses less digits than its factorization.

18727842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19422.

The product of its digits is 50176, while the sum is 39.

The square root of 18727842 is about 4327.5676771138. The cubic root of 18727842 is about 265.5599504287.

The spelling of 18727842 in words is "eighteen million, seven hundred twenty-seven thousand, eight hundred forty-two".