18727442 has 4 divisors (see below), whose sum is σ = 28091166. Its totient is φ = 9363720.

The previous prime is 18727433. The next prime is 18727459. The reversal of 18727442 is 24472781.

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: 24472781 = 29 ⋅843889.

It can be written as a sum of positive squares in only one way, i.e., 9431041 + 9296401 = 3071^2 + 3049^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4681859 + ... + 4681862.

Almost surely, 2^18727442 is an apocalyptic number.

18727442 is a deficient number, since it is larger than the sum of its proper divisors (9363724).

18727442 is an equidigital number, since it uses as much as digits as its factorization.

18727442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9363723.

The product of its digits is 25088, while the sum is 35.

The square root of 18727442 is about 4327.5214615297. The cubic root of 18727442 is about 265.5580597546.

The spelling of 18727442 in words is "eighteen million, seven hundred twenty-seven thousand, four hundred forty-two".