22724219 has 4 divisors (see below), whose sum is σ = 25970544. Its totient is φ = 19477896.

The previous prime is 22724183. The next prime is 22724231. The reversal of 22724219 is 91242722.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22724219 - 2¹⁶ = 22658683 is a prime.

It is a super-2 number, since 2×22724219² = 1032780258319922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22724191 and 22724200.

It is not an unprimeable number, because it can be changed into a prime (22724419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623152 + ... + 1623165.

It is an arithmetic number, because the mean of its divisors is an integer number (6492636).

Almost surely, 2^22724219 is an apocalyptic number.

22724219 is a deficient number, since it is larger than the sum of its proper divisors (3246325).

22724219 is an equidigital number, since it uses as much as digits as its factorization.

22724219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246324.

The product of its digits is 4032, while the sum is 29.

The square root of 22724219 is about 4766.9926578504. The cubic root of 22724219 is about 283.2454803363.

The spelling of 22724219 in words is "twenty-two million, seven hundred twenty-four thousand, two hundred nineteen".