22686989 has 4 divisors (see below), whose sum is σ = 24432156. Its totient is φ = 20941824.

The previous prime is 22686967. The next prime is 22686991. The reversal of 22686989 is 98968622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98968622 = 2 ⋅49484311.

It can be written as a sum of positive squares in 2 ways, for example, as 7344100 + 15342889 = 2710^2 + 3917^2 .

It is a cyclic number.

It is not a de Polignac number, because 22686989 - 2⁸ = 22686733 is a prime.

It is a super-2 number, since 2×22686989² = 1029398939772242, 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 (22686949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872564 + ... + 872589.

It is an arithmetic number, because the mean of its divisors is an integer number (6108039).

Almost surely, 2^22686989 is an apocalyptic number.

It is an amenable number.

22686989 is a deficient number, since it is larger than the sum of its proper divisors (1745167).

22686989 is a wasteful number, since it uses less digits than its factorization.

22686989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745166.

The product of its digits is 746496, while the sum is 50.

The square root of 22686989 is about 4763.0860794237. The cubic root of 22686989 is about 283.0907116382.

The spelling of 22686989 in words is "twenty-two million, six hundred eighty-six thousand, nine hundred eighty-nine".