18518530 has 16 divisors (see below), whose sum is σ = 34483320. Its totient is φ = 7151872.

The previous prime is 18518503. The next prime is 18518531. The reversal of 18518530 is 3581581.

It can be written as a sum of positive squares in 4 ways, for example, as 16168441 + 2350089 = 4021^2 + 1533^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18518492 and 18518501.

It is not an unprimeable number, because it can be changed into a prime (18518531) 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, 31639 + ... + 32218.

Almost surely, 2^18518530 is an apocalyptic number.

18518530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18518530 is a deficient number, since it is larger than the sum of its proper divisors (15964790).

18518530 is a wasteful number, since it uses less digits than its factorization.

18518530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63893.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 18518530 is about 4303.3161631467. The cubic root of 18518530 is about 264.5668966718.

The spelling of 18518530 in words is "eighteen million, five hundred eighteen thousand, five hundred thirty".