18216029 has 4 divisors (see below), whose sum is σ = 19617276. Its totient is φ = 16814784.

The previous prime is 18216017. The next prime is 18216043. The reversal of 18216029 is 92061281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92061281 = 13 ⋅7081637.

It can be written as a sum of positive squares in 2 ways, for example, as 8543929 + 9672100 = 2923^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 18216029 - 2⁸ = 18215773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18215992 and 18216010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18216049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700604 + ... + 700629.

It is an arithmetic number, because the mean of its divisors is an integer number (4904319).

Almost surely, 2^18216029 is an apocalyptic number.

It is an amenable number.

18216029 is a deficient number, since it is larger than the sum of its proper divisors (1401247).

18216029 is a wasteful number, since it uses less digits than its factorization.

18216029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401246.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18216029 is about 4268.0240158650. The cubic root of 18216029 is about 263.1184101539.

The spelling of 18216029 in words is "eighteen million, two hundred sixteen thousand, twenty-nine".