18394683129 has 27 divisors (see below), whose sum is σ = 27112664397. Its totient is φ = 12017637216.

The previous prime is 18394683121. The next prime is 18394683133. The reversal of 18394683129 is 92138649381.

The square root of 18394683129 is 135627.

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

18394683129 is a `hidden beast` number, since 183 + 94 + 68 + 312 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1753683129 + 16641000000 = 41877^2 + 129000^2 .

It is not a de Polignac number, because 18394683129 - 2³ = 18394683121 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18394683121) 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, 21564267 + ... + 21565119.

Almost surely, 2^18394683129 is an apocalyptic number.

18394683129 is the 135627-th square number.

18394683129 is the 67814-th centered octagonal number.

It is an amenable number.

18394683129 is a deficient number, since it is larger than the sum of its proper divisors (8717981268).

18394683129 is an frugal number, since it uses more digits than its factorization.

18394683129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818 (or 909 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 18394683129 in words is "eighteen billion, three hundred ninety-four million, six hundred eighty-three thousand, one hundred twenty-nine".