18518049 has 24 divisors (see below), whose sum is σ = 30899232. Its totient is φ = 10561920.

The previous prime is 18518039. The next prime is 18518051. The reversal of 18518049 is 94081581.

It is not a de Polignac number, because 18518049 - 2⁴ = 18518033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18518009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3819 + ... + 7184.

It is an arithmetic number, because the mean of its divisors is an integer number (1287468).

Almost surely, 2^18518049 is an apocalyptic number.

It is an amenable number.

18518049 is a deficient number, since it is larger than the sum of its proper divisors (12381183).

18518049 is a wasteful number, since it uses less digits than its factorization.

18518049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11037 (or 11034 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18518049 is about 4303.2602756515. The cubic root of 18518049 is about 264.5646060332.

The spelling of 18518049 in words is "eighteen million, five hundred eighteen thousand, forty-nine".