40002004 has 24 divisors (see below), whose sum is σ = 80138240. Its totient is φ = 17114976.

The previous prime is 40001999. The next prime is 40002023. The reversal of 40002004 is 40020004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30637 + ... + 31915.

Almost surely, 2^40002004 is an apocalyptic number.

It is an amenable number.

40002004 is an abundant number, since it is smaller than the sum of its proper divisors (40136236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40002004 is a wasteful number, since it uses less digits than its factorization.

40002004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407 (or 2405 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 40002004 is about 6324.7137484632. The cubic root of 40002004 is about 342.0009005596. Note that the first 3 decimals are identical.

Adding to 40002004 its reverse (40020004), we get a palindrome (80022008).

The spelling of 40002004 in words is "forty million, two thousand, four", and thus it is an eban number.