21839060 has 24 divisors (see below), whose sum is σ = 46982376. Its totient is φ = 8522240.

The previous prime is 21839057. The next prime is 21839071. The reversal of 21839060 is 6093812.

It can be written as a sum of positive squares in 4 ways, for example, as 3055504 + 18783556 = 1748^2 + 4334^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 12497 + ... + 14136.

It is an arithmetic number, because the mean of its divisors is an integer number (1957599).

Almost surely, 2^21839060 is an apocalyptic number.

21839060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21839060 is an abundant number, since it is smaller than the sum of its proper divisors (25143316).

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

21839060 is a wasteful number, since it uses less digits than its factorization.

21839060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26683 (or 26681 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21839060 is about 4673.2280064213. The cubic root of 21839060 is about 279.5189870646.

The spelling of 21839060 in words is "twenty-one million, eight hundred thirty-nine thousand, sixty".