22401289 has 3 divisors (see below), whose sum is σ = 22406023. Its totient is φ = 22396556.

The previous prime is 22401259. The next prime is 22401299. The reversal of 22401289 is 98210422.

The square root of 22401289 is 4733.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3980025 + 18421264 = 1995^2 + 4292^2 .

It is not a de Polignac number, because 22401289 - 2¹⁷ = 22270217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22401229) 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 2 ways as a sum of consecutive naturals, for example, 2367 + ... + 7099.

Almost surely, 2^22401289 is an apocalyptic number.

22401289 is the 4733-rd square number.

22401289 is the 2367-th centered octagonal number.

It is an amenable number.

22401289 is a deficient number, since it is larger than the sum of its proper divisors (4734).

22401289 is an frugal number, since it uses more digits than its factorization.

22401289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466 (or 4733 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The cubic root of 22401289 is about 281.8973563027.

Multiplying 22401289 by its product of nonzero digits (2304), we get a square (51612569856 = 227184²).

The spelling of 22401289 in words is "twenty-two million, four hundred one thousand, two hundred eighty-nine".