18000049 has 8 divisors (see below), whose sum is σ = 19030880. Its totient is φ = 16977600.

The previous prime is 18000041. The next prime is 18000067. The reversal of 18000049 is 94000081.

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 18000049 - 2³ = 18000041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17999993 and 18000029.

It is not an unprimeable number, because it can be changed into a prime (18000041) 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, 2614 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (2378860).

Almost surely, 2^18000049 is an apocalyptic number.

18000049 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18000049 is a deficient number, since it is larger than the sum of its proper divisors (1030831).

18000049 is a wasteful number, since it uses less digits than its factorization.

18000049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18000049 is about 4242.6464618207. The cubic root of 18000049 is about 262.0743772287.

The spelling of 18000049 in words is "eighteen million, forty-nine", and thus it is an aban number and an uban number.