22138385 has 8 divisors (see below), whose sum is σ = 26598696. Its totient is φ = 17688960.

The previous prime is 22138381. The next prime is 22138409. The reversal of 22138385 is 58383122.

It can be written as a sum of positive squares in 4 ways, for example, as 4464769 + 17673616 = 2113^2 + 4204^2 .

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

It is not a de Polignac number, because 22138385 - 2² = 22138381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22138381) 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 7 ways as a sum of consecutive naturals, for example, 2765 + ... + 7205.

It is an arithmetic number, because the mean of its divisors is an integer number (3324837).

Almost surely, 2^22138385 is an apocalyptic number.

It is an amenable number.

22138385 is a deficient number, since it is larger than the sum of its proper divisors (4460311).

22138385 is an equidigital number, since it uses as much as digits as its factorization.

22138385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443.

The product of its digits is 11520, while the sum is 32.

The square root of 22138385 is about 4705.1445248791. The cubic root of 22138385 is about 280.7902209577.

The spelling of 22138385 in words is "twenty-two million, one hundred thirty-eight thousand, three hundred eighty-five".