18639260386 has 16 divisors (see below), whose sum is σ = 28052533080. Its totient is φ = 9288437760.

The previous prime is 18639260371. The next prime is 18639260389. The reversal of 18639260386 is 68306293681.

It can be written as a sum of positive squares in 4 ways, for example, as 12000107025 + 6639153361 = 109545^2 + 81481^2 .

It is not an unprimeable number, because it can be changed into a prime (18639260389) 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, 3373306 + ... + 3378826.

Almost surely, 2^18639260386 is an apocalyptic number.

18639260386 is a deficient number, since it is larger than the sum of its proper divisors (9413272694).

18639260386 is a wasteful number, since it uses less digits than its factorization.

18639260386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10869.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 18639260386 in words is "eighteen billion, six hundred thirty-nine million, two hundred sixty thousand, three hundred eighty-six".