16621230 has 32 divisors (see below), whose sum is σ = 40124448. Its totient is φ = 4406400.

The previous prime is 16621229. The next prime is 16621259. The reversal of 16621230 is 3212661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16621197 and 16621206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3900 + ... + 6960.

It is an arithmetic number, because the mean of its divisors is an integer number (1253889).

Almost surely, 2^16621230 is an apocalyptic number.

16621230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16621230 is an abundant number, since it is smaller than the sum of its proper divisors (23503218).

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

16621230 is a wasteful number, since it uses less digits than its factorization.

16621230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 16621230 is about 4076.9142743011. The cubic root of 16621230 is about 255.2041425643.

Adding to 16621230 its reverse (3212661), we get a palindrome (19833891).

The spelling of 16621230 in words is "sixteen million, six hundred twenty-one thousand, two hundred thirty".