23218705 has 16 divisors (see below), whose sum is σ = 29445120. Its totient is φ = 17547712.

The previous prime is 23218693. The next prime is 23218709. The reversal of 23218705 is 50781232.

23218705 is a nontrivial binomial coefficient, being equal to C(6815, 2).

It is a cyclic number.

It is not a de Polignac number, because 23218705 - 2⁵ = 23218673 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (23218709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5112 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (1840320).

Almost surely, 2^23218705 is an apocalyptic number.

23218705 is the 6814-th triangular number.

23218705 is the 2272-nd centered nonagonal number.

It is an amenable number.

23218705 is a deficient number, since it is larger than the sum of its proper divisors (6226415).

23218705 is a wasteful number, since it uses less digits than its factorization.

23218705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 23218705 is about 4818.5791474251. The cubic root of 23218705 is about 285.2852586572.

Adding to 23218705 its reverse (50781232), we get a palindrome (73999937).

It can be divided in two parts, 2321 and 8705, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 23218705 in words is "twenty-three million, two hundred eighteen thousand, seven hundred five".