18129794 has 4 divisors (see below), whose sum is σ = 27194694. Its totient is φ = 9064896.

The previous prime is 18129791. The next prime is 18129847. The reversal of 18129794 is 49792181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49792181 = 109 ⋅456809.

It can be written as a sum of positive squares in only one way, i.e., 9690769 + 8439025 = 3113^2 + 2905^2 .

It is not an unprimeable number, because it can be changed into a prime (18129791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4532447 + ... + 4532450.

Almost surely, 2^18129794 is an apocalyptic number.

18129794 is a deficient number, since it is larger than the sum of its proper divisors (9064900).

18129794 is an equidigital number, since it uses as much as digits as its factorization.

18129794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9064899.

The product of its digits is 36288, while the sum is 41.

The square root of 18129794 is about 4257.9095810033. The cubic root of 18129794 is about 262.7025508477.

The spelling of 18129794 in words is "eighteen million, one hundred twenty-nine thousand, seven hundred ninety-four".