21843460 has 12 divisors (see below), whose sum is σ = 45871308. Its totient is φ = 8737376.

The previous prime is 21843449. The next prime is 21843461. The reversal of 21843460 is 6434812.

It can be written as a sum of positive squares in 2 ways, for example, as 8433216 + 13410244 = 2904^2 + 3662^2 .

It is not an unprimeable number, because it can be changed into a prime (21843461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546067 + ... + 546106.

It is an arithmetic number, because the mean of its divisors is an integer number (3822609).

Almost surely, 2^21843460 is an apocalyptic number.

21843460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21843460 is an abundant number, since it is smaller than the sum of its proper divisors (24027848).

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

21843460 is a wasteful number, since it uses less digits than its factorization.

21843460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092182 (or 1092180 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21843460 is about 4673.6987493847. The cubic root of 21843460 is about 279.5377577284.

The spelling of 21843460 in words is "twenty-one million, eight hundred forty-three thousand, four hundred sixty".