22299381 has 42 divisors (see below), whose sum is σ = 36403458. Its totient is φ = 13646880.

The previous prime is 22299377. The next prime is 22299391. The reversal of 22299381 is 18399222.

It can be written as a sum of positive squares in 3 ways, for example, as 2452356 + 19847025 = 1566^2 + 4455^2 .

It is not a de Polignac number, because 22299381 - 2² = 22299377 is a prime.

It is a super-2 number, since 2×22299381² = 994524785966322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22299301) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 123111 + ... + 123291.

It is an arithmetic number, because the mean of its divisors is an integer number (866749).

Almost surely, 2^22299381 is an apocalyptic number.

It is an amenable number.

22299381 is a deficient number, since it is larger than the sum of its proper divisors (14104077).

22299381 is an equidigital number, since it uses as much as digits as its factorization.

22299381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 197 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 22299381 is about 4722.2220405229. Note that the first 3 decimals coincide. The cubic root of 22299381 is about 281.4692370582.

The spelling of 22299381 in words is "twenty-two million, two hundred ninety-nine thousand, three hundred eighty-one".