22186729 has 2 divisors, whose sum is σ = 22186730. Its totient is φ = 22186728.

The previous prime is 22186727. The next prime is 22186777. The reversal of 22186729 is 92768122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18045504 + 4141225 = 4248^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 22186729 - 2¹ = 22186727 is a prime.

Together with 22186727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22186727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11093364 + 11093365.

It is an arithmetic number, because the mean of its divisors is an integer number (11093365).

Almost surely, 2^22186729 is an apocalyptic number.

It is an amenable number.

22186729 is a deficient number, since it is larger than the sum of its proper divisors (1).

22186729 is an equidigital number, since it uses as much as digits as its factorization.

22186729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 22186729 is about 4710.2790787808. The cubic root of 22186729 is about 280.9944612916.

The spelling of 22186729 in words is "twenty-two million, one hundred eighty-six thousand, seven hundred twenty-nine".