30021830 has 16 divisors (see below), whose sum is σ = 57218400. Its totient is φ = 11302272.

The previous prime is 30021809. The next prime is 30021833. The reversal of 30021830 is 3812003.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 30021799 and 30021808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30021833) by changing a digit.

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, 88130 + ... + 88469.

It is an arithmetic number, because the mean of its divisors is an integer number (3576150).

Almost surely, 2^30021830 is an apocalyptic number.

30021830 is a deficient number, since it is larger than the sum of its proper divisors (27196570).

30021830 is a wasteful number, since it uses less digits than its factorization.

30021830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176623.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 30021830 is about 5479.2180098989. The cubic root of 30021830 is about 310.7985999726.

Adding to 30021830 its reverse (3812003), we get a palindrome (33833833).

The spelling of 30021830 in words is "thirty million, twenty-one thousand, eight hundred thirty".