22278401 has 8 divisors (see below), whose sum is σ = 22589160. Its totient is φ = 21969792.

The previous prime is 22278383. The next prime is 22278407. The reversal of 22278401 is 10487222.

It is a Cunningham number, because it is equal to 4720²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 22278400 = 1^2 + 4720^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22278401 - 2¹⁰ = 22277377 is a prime.

It is a super-2 number, since 2×22278401² = 992654302233602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22278407) 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 7 ways as a sum of consecutive naturals, for example, 33791 + ... + 34443.

It is an arithmetic number, because the mean of its divisors is an integer number (2823645).

Almost surely, 2^22278401 is an apocalyptic number.

It is an amenable number.

22278401 is a deficient number, since it is larger than the sum of its proper divisors (310759).

22278401 is a wasteful number, since it uses less digits than its factorization.

22278401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 22278401 is about 4720.0001059322. Note that the first 3 decimals coincide. The cubic root of 22278401 is about 281.3809374845.

The spelling of 22278401 in words is "twenty-two million, two hundred seventy-eight thousand, four hundred one".