18129736 has 8 divisors (see below), whose sum is σ = 33993270. Its totient is φ = 9064864.

The previous prime is 18129721. The next prime is 18129737. The reversal of 18129736 is 63792181.

It can be written as a sum of positive squares in only one way, i.e., 16760836 + 1368900 = 4094^2 + 1170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18129695 and 18129704.

It is not an unprimeable number, because it can be changed into a prime (18129737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1133101 + ... + 1133116.

Almost surely, 2^18129736 is an apocalyptic number.

It is an amenable number.

18129736 is a deficient number, since it is larger than the sum of its proper divisors (15863534).

18129736 is a wasteful number, since it uses less digits than its factorization.

18129736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266223 (or 2266219 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 18129736 is about 4257.9027701440. The cubic root of 18129736 is about 262.7022707054.

The spelling of 18129736 in words is "eighteen million, one hundred twenty-nine thousand, seven hundred thirty-six".