22400581 has 8 divisors (see below), whose sum is σ = 25655040. Its totient is φ = 19159728.

The previous prime is 22400533. The next prime is 22400591. The reversal of 22400581 is 18500422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22400581 - 2⁷ = 22400453 is a prime.

It is a super-2 number, since 2×22400581² = 1003572058275122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22400591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420 + ... + 6706.

It is an arithmetic number, because the mean of its divisors is an integer number (3206880).

Almost surely, 2^22400581 is an apocalyptic number.

It is an amenable number.

22400581 is a deficient number, since it is larger than the sum of its proper divisors (3254459).

22400581 is an equidigital number, since it uses as much as digits as its factorization.

22400581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 22400581 is about 4732.9252054094. The cubic root of 22400581 is about 281.8943864523.

The spelling of 22400581 in words is "twenty-two million, four hundred thousand, five hundred eighty-one".