22401891 has 12 divisors (see below), whose sum is σ = 33474480. Its totient is φ = 14419440.

The previous prime is 22401889. The next prime is 22401947. The reversal of 22401891 is 19810422.

It is not a de Polignac number, because 22401891 - 2¹ = 22401889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22401811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42655 + ... + 43176.

It is an arithmetic number, because the mean of its divisors is an integer number (2789540).

Almost surely, 2^22401891 is an apocalyptic number.

22401891 is a deficient number, since it is larger than the sum of its proper divisors (11072589).

22401891 is a wasteful number, since it uses less digits than its factorization.

22401891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85866 (or 85863 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 22401891 is about 4733.0635956006. The cubic root of 22401891 is about 281.8998814653.

The spelling of 22401891 in words is "twenty-two million, four hundred one thousand, eight hundred ninety-one".