40002538 has 4 divisors (see below), whose sum is σ = 60003810. Its totient is φ = 20001268.

The previous prime is 40002491. The next prime is 40002559. The reversal of 40002538 is 83520004.

40002538 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., 39601849 + 400689 = 6293^2 + 633^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 10000633 + ... + 10000636.

Almost surely, 2^40002538 is an apocalyptic number.

40002538 is a deficient number, since it is larger than the sum of its proper divisors (20001272).

40002538 is a wasteful number, since it uses less digits than its factorization.

40002538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20001271.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40002538 is about 6324.7559636716. The cubic root of 40002538 is about 342.0024223806.

The spelling of 40002538 in words is "forty million, two thousand, five hundred thirty-eight".