21894672 has 40 divisors (see below), whose sum is σ = 56737440. Its totient is φ = 7275520.

The previous prime is 21894667. The next prime is 21894683. The reversal of 21894672 is 27649812.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21894672.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23104 + ... + 24032.

It is an arithmetic number, because the mean of its divisors is an integer number (1418436).

Almost surely, 2^21894672 is an apocalyptic number.

It is an amenable number.

21894672 is an abundant number, since it is smaller than the sum of its proper divisors (34842768).

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

21894672 is a wasteful number, since it uses less digits than its factorization.

21894672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431 (or 1425 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 21894672 is about 4679.1742861321. The cubic root of 21894672 is about 279.7560460168.

The spelling of 21894672 in words is "twenty-one million, eight hundred ninety-four thousand, six hundred seventy-two".