18072799 has 4 divisors (see below), whose sum is σ = 18087336. Its totient is φ = 18058264.

The previous prime is 18072797. The next prime is 18072809. The reversal of 18072799 is 99727081.

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: 99727081 = 89 ⋅1120529.

It is a cyclic number.

It is not a de Polignac number, because 18072799 - 2¹ = 18072797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18072793) 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, 5209 + ... + 7954.

It is an arithmetic number, because the mean of its divisors is an integer number (4521834).

Almost surely, 2^18072799 is an apocalyptic number.

18072799 is a deficient number, since it is larger than the sum of its proper divisors (14537).

18072799 is a wasteful number, since it uses less digits than its factorization.

18072799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14536.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 18072799 is about 4251.2114743917. The cubic root of 18072799 is about 262.4269740932.

The spelling of 18072799 in words is "eighteen million, seventy-two thousand, seven hundred ninety-nine".