21830738 has 16 divisors (see below), whose sum is σ = 33264000. Its totient is φ = 10744272.

The previous prime is 21830719. The next prime is 21830759. The reversal of 21830738 is 83703812.

It is a super-2 number, since 2×21830738² = 953162243249288, which contains 22 as substring.

It is a Curzon 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 in 7 ways as a sum of consecutive naturals, for example, 51893 + ... + 52311.

It is an arithmetic number, because the mean of its divisors is an integer number (2079000).

Almost surely, 2^21830738 is an apocalyptic number.

21830738 is a deficient number, since it is larger than the sum of its proper divisors (11433262).

21830738 is a wasteful number, since it uses less digits than its factorization.

21830738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 21830738 is about 4672.3375306157. The cubic root of 21830738 is about 279.4834780189.

The spelling of 21830738 in words is "twenty-one million, eight hundred thirty thousand, seven hundred thirty-eight".