18727994 has 8 divisors (see below), whose sum is σ = 28851348. Its totient is φ = 9110880.

The previous prime is 18727991. The next prime is 18728009. The reversal of 18727994 is 49972781.

It can be written as a sum of positive squares in 2 ways, for example, as 18601969 + 126025 = 4313^2 + 355^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18727991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126467 + ... + 126614.

Almost surely, 2^18727994 is an apocalyptic number.

18727994 is a deficient number, since it is larger than the sum of its proper divisors (10123354).

18727994 is a wasteful number, since it uses less digits than its factorization.

18727994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253120.

The product of its digits is 254016, while the sum is 47.

The square root of 18727994 is about 4327.5852389063. The cubic root of 18727994 is about 265.5606688778.

The spelling of 18727994 in words is "eighteen million, seven hundred twenty-seven thousand, nine hundred ninety-four".