18007249 has 8 divisors (see below), whose sum is σ = 20018432. Its totient is φ = 16085520.

The previous prime is 18007247. The next prime is 18007259. The reversal of 18007249 is 94270081.

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

It is a cyclic number.

It is not a de Polignac number, because 18007249 - 2¹ = 18007247 is a prime.

It is a super-2 number, since 2×18007249² = 648522033096002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18007249.

It is not an unprimeable number, because it can be changed into a prime (18007243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21939 + ... + 22744.

It is an arithmetic number, because the mean of its divisors is an integer number (2502304).

Almost surely, 2^18007249 is an apocalyptic number.

It is an amenable number.

18007249 is a deficient number, since it is larger than the sum of its proper divisors (2011183).

18007249 is a wasteful number, since it uses less digits than its factorization.

18007249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44727.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18007249 is about 4243.4949039677. The cubic root of 18007249 is about 262.1093157258.

The spelling of 18007249 in words is "eighteen million, seven thousand, two hundred forty-nine".