21739000 has 32 divisors (see below), whose sum is σ = 50871600. Its totient is φ = 8695200.

The previous prime is 21738989. The next prime is 21739001. The reversal of 21739000 is 93712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21739001) 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, 9870 + ... + 11869.

Almost surely, 2^21739000 is an apocalyptic number.

21739000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21739000 is an abundant number, since it is smaller than the sum of its proper divisors (29132600).

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

21739000 is a wasteful number, since it uses less digits than its factorization.

21739000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21760 (or 21746 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 21739000 is about 4662.5100536085. The cubic root of 21739000 is about 279.0914428147.

The spelling of 21739000 in words is "twenty-one million, seven hundred thirty-nine thousand".