22779409 has 4 divisors (see below), whose sum is σ = 22789360. Its totient is φ = 22769460.

The previous prime is 22779403. The next prime is 22779437. The reversal of 22779409 is 90497722.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22779409 - 2¹⁵ = 22746641 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (22779403) 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, 382 + ... + 6760.

It is an arithmetic number, because the mean of its divisors is an integer number (5697340).

Almost surely, 2^22779409 is an apocalyptic number.

It is an amenable number.

22779409 is a deficient number, since it is larger than the sum of its proper divisors (9951).

22779409 is an equidigital number, since it uses as much as digits as its factorization.

22779409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9950.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 22779409 is about 4772.7779122855. Note that the first 3 decimals coincide. The cubic root of 22779409 is about 283.4745997584.

The spelling of 22779409 in words is "twenty-two million, seven hundred seventy-nine thousand, four hundred nine".