40638823 has 4 divisors (see below), whose sum is σ = 43029360. Its totient is φ = 38248288.

The previous prime is 40638821. The next prime is 40638847. The reversal of 40638823 is 32883604.

40638823 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 40638823 - 2¹ = 40638821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638821) 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, 1195243 + ... + 1195276.

It is an arithmetic number, because the mean of its divisors is an integer number (10757340).

Almost surely, 2^40638823 is an apocalyptic number.

40638823 is a deficient number, since it is larger than the sum of its proper divisors (2390537).

40638823 is a wasteful number, since it uses less digits than its factorization.

40638823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390536.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 40638823 is about 6374.8586651000. The cubic root of 40638823 is about 343.8062022486.

The spelling of 40638823 in words is "forty million, six hundred thirty-eight thousand, eight hundred twenty-three".