21794872 has 32 divisors (see below), whose sum is σ = 45431280. Its totient is φ = 9717760.

The previous prime is 21794837. The next prime is 21794879. The reversal of 21794872 is 27849712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794879) 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, 2328 + ... + 7000.

Almost surely, 2^21794872 is an apocalyptic number.

21794872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21794872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22715640).

21794872 is an abundant number, since it is smaller than the sum of its proper divisors (23636408).

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

21794872 is a wasteful number, since it uses less digits than its factorization.

21794872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743 (or 4739 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 21794872 is about 4668.4978312087. The cubic root of 21794872 is about 279.3303384574.

The spelling of 21794872 in words is "twenty-one million, seven hundred ninety-four thousand, eight hundred seventy-two".