22401865 has 8 divisors (see below), whose sum is σ = 26951688. Its totient is φ = 17875200.

The previous prime is 22401853. The next prime is 22401889. The reversal of 22401865 is 56810422.

It can be written as a sum of positive squares in 4 ways, for example, as 8173881 + 14227984 = 2859^2 + 3772^2 .

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

It is not a de Polignac number, because 22401865 - 2¹³ = 22393673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 3582 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (3368961).

Almost surely, 2^22401865 is an apocalyptic number.

It is an amenable number.

22401865 is a deficient number, since it is larger than the sum of its proper divisors (4549823).

22401865 is a wasteful number, since it uses less digits than its factorization.

22401865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11579.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 22401865 is about 4733.0608489644. The cubic root of 22401865 is about 281.8997724060.

The spelling of 22401865 in words is "twenty-two million, four hundred one thousand, eight hundred sixty-five".