40638923 has 12 divisors (see below), whose sum is σ = 45430848. Its totient is φ = 36298080.

The previous prime is 40638919. The next prime is 40638931. The reversal of 40638923 is 32983604.

It is a happy number.

40638923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40638923 - 2² = 40638919 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 1361 + ... + 9117.

It is an arithmetic number, because the mean of its divisors is an integer number (3785904).

Almost surely, 2^40638923 is an apocalyptic number.

40638923 is a deficient number, since it is larger than the sum of its proper divisors (4791925).

40638923 is a wasteful number, since it uses less digits than its factorization.

40638923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7814 (or 7801 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 40638923 is about 6374.8665084063. The cubic root of 40638923 is about 343.8064842498.

The spelling of 40638923 in words is "forty million, six hundred thirty-eight thousand, nine hundred twenty-three".