21798592 has 42 divisors (see below), whose sum is σ = 44765468. Its totient is φ = 10526208.

The previous prime is 21798571. The next prime is 21798599. The reversal of 21798592 is 29589712.

It is a super-2 number, since 2×21798592² = 950357226364928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (21798599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 244884 + ... + 244972.

Almost surely, 2^21798592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21798592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22382734).

21798592 is an abundant number, since it is smaller than the sum of its proper divisors (22966876).

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

21798592 is an frugal number, since it uses more digits than its factorization.

21798592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 134 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 21798592 is about 4668.8962293030. The cubic root of 21798592 is about 279.3462298063.

Multiplying 21798592 by its sum of digits (43), we get a square (937339456 = 30616²).

21798592 divided by its sum of digits (43) gives a square (506944 = 712²).

The spelling of 21798592 in words is "twenty-one million, seven hundred ninety-eight thousand, five hundred ninety-two".