11859863409 has 27 divisors (see below), whose sum is σ = 17716479417. Its totient is φ = 7644990600.

The previous prime is 11859863381. The next prime is 11859863419. The reversal of 11859863409 is 90436895811.

The square root of 11859863409 is 108903.

It is a perfect power (a square), and thus also a powerful number.

11859863409 is a `hidden beast` number, since 1 + 1 + 8 + 598 + 6 + 3 + 40 + 9 = 666.

It is not a de Polignac number, because 11859863409 - 2⁹ = 11859862897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11859863419) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10127394 + ... + 10128564.

Almost surely, 2^11859863409 is an apocalyptic number.

11859863409 is the 108903-rd square number.

11859863409 is the 54452-nd centered octagonal number.

It is an amenable number.

11859863409 is a deficient number, since it is larger than the sum of its proper divisors (5856616008).

11859863409 is an frugal number, since it uses more digits than its factorization.

11859863409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 11859863409 in words is "eleven billion, eight hundred fifty-nine million, eight hundred sixty-three thousand, four hundred nine".