21839000 has 32 divisors (see below), whose sum is σ = 51105600. Its totient is φ = 8735200.

The previous prime is 21838967. The next prime is 21839003. The reversal of 21839000 is 93812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21839003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9920 + ... + 11919.

It is an arithmetic number, because the mean of its divisors is an integer number (1597050).

Almost surely, 2^21839000 is an apocalyptic number.

21839000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21839000 is an abundant number, since it is smaller than the sum of its proper divisors (29266600).

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

21839000 is a wasteful number, since it uses less digits than its factorization.

21839000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21860 (or 21846 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 21839000 is about 4673.2215868713. The cubic root of 21839000 is about 279.5187310836.

The spelling of 21839000 in words is "twenty-one million, eight hundred thirty-nine thousand".