22389781 has 8 divisors (see below), whose sum is σ = 23344128. Its totient is φ = 21450000.

The previous prime is 22389767. The next prime is 22389793. The reversal of 22389781 is 18798322.

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 22389781 - 2¹³ = 22381589 is a prime.

It is a super-2 number, since 2×22389781² = 1002604586455922, 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 (22389701) 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, 445 + ... + 6706.

It is an arithmetic number, because the mean of its divisors is an integer number (2918016).

Almost surely, 2^22389781 is an apocalyptic number.

It is an amenable number.

22389781 is a deficient number, since it is larger than the sum of its proper divisors (954347).

22389781 is a wasteful number, since it uses less digits than its factorization.

22389781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7283.

The product of its digits is 48384, while the sum is 40.

The square root of 22389781 is about 4731.7841244080. The cubic root of 22389781 is about 281.8490758898.

The spelling of 22389781 in words is "twenty-two million, three hundred eighty-nine thousand, seven hundred eighty-one".