18135963 has 6 divisors (see below), whose sum is σ = 26196404. Its totient is φ = 12090636.

The previous prime is 18135947. The next prime is 18135967. The reversal of 18135963 is 36953181.

It is a happy number.

It is not a de Polignac number, because 18135963 - 2⁴ = 18135947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18135967) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1007545 + ... + 1007562.

Almost surely, 2^18135963 is an apocalyptic number.

18135963 is a deficient number, since it is larger than the sum of its proper divisors (8060441).

18135963 is a wasteful number, since it uses less digits than its factorization.

18135963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015113 (or 2015110 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 18135963 is about 4258.6339359001. The cubic root of 18135963 is about 262.7323439470.

It can be divided in two parts, 1813 and 5963, that added together give a 5-th power (7776 = 6⁵).

The spelling of 18135963 in words is "eighteen million, one hundred thirty-five thousand, nine hundred sixty-three".