18129742 has 4 divisors (see below), whose sum is σ = 27194616. Its totient is φ = 9064870.

The previous prime is 18129739. The next prime is 18129757. The reversal of 18129742 is 24792181.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 18129698 and 18129707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4532434 + ... + 4532437.

It is an arithmetic number, because the mean of its divisors is an integer number (6798654).

Almost surely, 2^18129742 is an apocalyptic number.

18129742 is a deficient number, since it is larger than the sum of its proper divisors (9064874).

18129742 is an equidigital number, since it uses as much as digits as its factorization.

18129742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9064873.

The product of its digits is 8064, while the sum is 34.

The square root of 18129742 is about 4257.9034747162. The cubic root of 18129742 is about 262.7022996857.

The spelling of 18129742 in words is "eighteen million, one hundred twenty-nine thousand, seven hundred forty-two".