40638842 has 4 divisors (see below), whose sum is σ = 60958266. Its totient is φ = 20319420.

The previous prime is 40638821. The next prime is 40638847. The reversal of 40638842 is 24883604.

40638842 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 can be written as a sum of positive squares in only one way, i.e., 33884041 + 6754801 = 5821^2 + 2599^2 .

It is not an unprimeable number, because it can be changed into a prime (40638847) 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 as a sum of consecutive naturals, namely, 10159709 + ... + 10159712.

Almost surely, 2^40638842 is an apocalyptic number.

40638842 is a deficient number, since it is larger than the sum of its proper divisors (20319424).

40638842 is a wasteful number, since it uses less digits than its factorization.

40638842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20319423.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 40638842 is about 6374.8601553289. The cubic root of 40638842 is about 343.8062558289.

The spelling of 40638842 in words is "forty million, six hundred thirty-eight thousand, eight hundred forty-two".