223440397 has 4 divisors (see below), whose sum is σ = 228194496. Its totient is φ = 218686300.

The previous prime is 223440379. The next prime is 223440403. The reversal of 223440397 is 793044322.

It is a happy number.

223440397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 223440397 - 2¹⁵ = 223407629 is a prime.

It is a super-2 number, since 2×223440397² = 99851222023035218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223440317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2376979 + ... + 2377072.

It is an arithmetic number, because the mean of its divisors is an integer number (57048624).

Almost surely, 2^223440397 is an apocalyptic number.

It is an amenable number.

223440397 is a deficient number, since it is larger than the sum of its proper divisors (4754099).

223440397 is an equidigital number, since it uses as much as digits as its factorization.

223440397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4754098.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 223440397 is about 14947.9228322868. The cubic root of 223440397 is about 606.8116332644.

The spelling of 223440397 in words is "two hundred twenty-three million, four hundred forty thousand, three hundred ninety-seven".