21830490 has 48 divisors (see below), whose sum is σ = 61922016. Its totient is φ = 5292000.

The previous prime is 21830453. The next prime is 21830507. The reversal of 21830490 is 9403812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10036 + ... + 12015.

It is an arithmetic number, because the mean of its divisors is an integer number (1290042).

Almost surely, 2^21830490 is an apocalyptic number.

21830490 is an abundant number, since it is smaller than the sum of its proper divisors (40091526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21830490 is a wasteful number, since it uses less digits than its factorization.

21830490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22075 (or 22072 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21830490 is about 4672.3109913618. The cubic root of 21830490 is about 279.4824196921.

The spelling of 21830490 in words is "twenty-one million, eight hundred thirty thousand, four hundred ninety".