22138691 has 8 divisors (see below), whose sum is σ = 22822800. Its totient is φ = 21459168.

The previous prime is 22138651. The next prime is 22138733. The reversal of 22138691 is 19683122.

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

It is a cyclic number.

It is not a de Polignac number, because 22138691 - 2¹⁰ = 22137667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22138631) 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, 10385 + ... + 12333.

It is an arithmetic number, because the mean of its divisors is an integer number (2852850).

Almost surely, 2^22138691 is an apocalyptic number.

22138691 is a deficient number, since it is larger than the sum of its proper divisors (684109).

22138691 is a wasteful number, since it uses less digits than its factorization.

22138691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293.

The product of its digits is 5184, while the sum is 32.

The square root of 22138691 is about 4705.1770423651. The cubic root of 22138691 is about 280.7915146596.

The spelling of 22138691 in words is "twenty-two million, one hundred thirty-eight thousand, six hundred ninety-one".