21839484 has 12 divisors (see below), whose sum is σ = 50958824. Its totient is φ = 7279824.

The previous prime is 21839479. The next prime is 21839491. The reversal of 21839484 is 48493812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21839484² = 953926122772512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909967 + ... + 909990.

Almost surely, 2^21839484 is an apocalyptic number.

It is an amenable number.

21839484 is an abundant number, since it is smaller than the sum of its proper divisors (29119340).

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

21839484 is a wasteful number, since it uses less digits than its factorization.

21839484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819964 (or 1819962 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 21839484 is about 4673.2733709895. The cubic root of 21839484 is about 279.5207959838.

The spelling of 21839484 in words is "twenty-one million, eight hundred thirty-nine thousand, four hundred eighty-four".