18518536 has 8 divisors (see below), whose sum is σ = 34722270. Its totient is φ = 9259264.

The previous prime is 18518531. The next prime is 18518551. The reversal of 18518536 is 63581581.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 828100 = 4206^2 + 910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18518495 and 18518504.

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 as a sum of consecutive naturals, namely, 1157401 + ... + 1157416.

Almost surely, 2^18518536 is an apocalyptic number.

It is an amenable number.

18518536 is a deficient number, since it is larger than the sum of its proper divisors (16203734).

18518536 is a wasteful number, since it uses less digits than its factorization.

18518536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314823 (or 2314819 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 18518536 is about 4303.3168602835. The cubic root of 18518536 is about 264.5669252450.

It can be divided in two parts, 185 and 18536, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 18518536 in words is "eighteen million, five hundred eighteen thousand, five hundred thirty-six".