22187401 has 4 divisors (see below), whose sum is σ = 22491412. Its totient is φ = 21883392.

The previous prime is 22187371. The next prime is 22187461. The reversal of 22187401 is 10478122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10478122 = 2 ⋅5239061.

It can be written as a sum of positive squares in 2 ways, for example, as 15217801 + 6969600 = 3901^2 + 2640^2 .

It is a cyclic number.

It is not a de Polignac number, because 22187401 - 2⁵ = 22187369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22187461) 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 3 ways as a sum of consecutive naturals, for example, 151896 + ... + 152041.

It is an arithmetic number, because the mean of its divisors is an integer number (5622853).

Almost surely, 2^22187401 is an apocalyptic number.

It is an amenable number.

22187401 is a deficient number, since it is larger than the sum of its proper divisors (304011).

22187401 is an equidigital number, since it uses as much as digits as its factorization.

22187401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304010.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 22187401 is about 4710.3504115936. The cubic root of 22187401 is about 280.9972982183.

The spelling of 22187401 in words is "twenty-two million, one hundred eighty-seven thousand, four hundred one".