18534641 has 4 divisors (see below), whose sum is σ = 19624932. Its totient is φ = 17444352.

The previous prime is 18534631. The next prime is 18534697. The reversal of 18534641 is 14643581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14643581 = 73 ⋅200597.

It can be written as a sum of positive squares in 2 ways, for example, as 15437041 + 3097600 = 3929^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 18534641 - 2¹⁴ = 18518257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18534598 and 18534607.

It is not an unprimeable number, because it can be changed into a prime (18534631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545120 + ... + 545153.

It is an arithmetic number, because the mean of its divisors is an integer number (4906233).

Almost surely, 2^18534641 is an apocalyptic number.

It is an amenable number.

18534641 is a deficient number, since it is larger than the sum of its proper divisors (1090291).

18534641 is a wasteful number, since it uses less digits than its factorization.

18534641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090290.

The product of its digits is 11520, while the sum is 32.

The square root of 18534641 is about 4305.1876846428. The cubic root of 18534641 is about 264.6435982562.

The spelling of 18534641 in words is "eighteen million, five hundred thirty-four thousand, six hundred forty-one".