22787989 has 6 divisors (see below), whose sum is σ = 26508534. Its totient is φ = 19532520.

The previous prime is 22787977. The next prime is 22787993. The reversal of 22787989 is 98978722.

It can be written as a sum of positive squares in only one way, i.e., 17288964 + 5499025 = 4158^2 + 2345^2 .

It is not a de Polignac number, because 22787989 - 2¹³ = 22779797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22787929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 232482 + ... + 232579.

It is an arithmetic number, because the mean of its divisors is an integer number (4418089).

Almost surely, 2^22787989 is an apocalyptic number.

It is an amenable number.

22787989 is a deficient number, since it is larger than the sum of its proper divisors (3720545).

22787989 is an equidigital number, since it uses as much as digits as its factorization.

22787989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465075 (or 465068 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 52.

The square root of 22787989 is about 4773.6766752682. The cubic root of 22787989 is about 283.5101860893.

The spelling of 22787989 in words is "twenty-two million, seven hundred eighty-seven thousand, nine hundred eighty-nine".