22401309 has 8 divisors (see below), whose sum is σ = 34135360. Its totient is φ = 12800736.

The previous prime is 22401299. The next prime is 22401331. The reversal of 22401309 is 90310422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22401309 - 2⁹ = 22400797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1066729 = 22401309 / (2 + 2 + 4 + 0 + 1 + 3 + 0 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22401349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533344 + ... + 533385.

It is an arithmetic number, because the mean of its divisors is an integer number (4266920).

Almost surely, 2^22401309 is an apocalyptic number.

It is an amenable number.

22401309 is a deficient number, since it is larger than the sum of its proper divisors (11734051).

22401309 is a wasteful number, since it uses less digits than its factorization.

22401309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066739.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 22401309 is about 4733.0021128244. The cubic root of 22401309 is about 281.8974401959.

The spelling of 22401309 in words is "twenty-two million, four hundred one thousand, three hundred nine".