40638223 has 4 divisors (see below), whose sum is σ = 40667040. Its totient is φ = 40609408.

The previous prime is 40638187. The next prime is 40638239. The reversal of 40638223 is 32283604.

40638223 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.

It is a cyclic number.

It is not a de Polignac number, because 40638223 - 2¹⁷ = 40507151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40638191 and 40638200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638523) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12178 + ... + 15151.

It is an arithmetic number, because the mean of its divisors is an integer number (10166760).

Almost surely, 2^40638223 is an apocalyptic number.

40638223 is a deficient number, since it is larger than the sum of its proper divisors (28817).

40638223 is a wasteful number, since it uses less digits than its factorization.

40638223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28816.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40638223 is about 6374.8116050594. The cubic root of 40638223 is about 343.8045102316.

The spelling of 40638223 in words is "forty million, six hundred thirty-eight thousand, two hundred twenty-three".