18008749 has 8 divisors (see below), whose sum is σ = 19706400. Its totient is φ = 16321200.

The previous prime is 18008693. The next prime is 18008777. The reversal of 18008749 is 94780081.

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 18008749 - 2⁷ = 18008621 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 (18003749) 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, 1494 + ... + 6184.

It is an arithmetic number, because the mean of its divisors is an integer number (2463300).

Almost surely, 2^18008749 is an apocalyptic number.

It is an amenable number.

18008749 is a deficient number, since it is larger than the sum of its proper divisors (1697651).

18008749 is a wasteful number, since it uses less digits than its factorization.

18008749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18008749 is about 4243.6716413973. The cubic root of 18008749 is about 262.1165934071.

The spelling of 18008749 in words is "eighteen million, eight thousand, seven hundred forty-nine".