40021804 has 6 divisors (see below), whose sum is σ = 70038164. Its totient is φ = 20010900.

The previous prime is 40021789. The next prime is 40021819. The reversal of 40021804 is 40812004.

40021804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40021789) and next prime (40021819).

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, 5002722 + ... + 5002729.

Almost surely, 2^40021804 is an apocalyptic number.

It is an amenable number.

40021804 is a deficient number, since it is larger than the sum of its proper divisors (30016360).

40021804 is a wasteful number, since it uses less digits than its factorization.

40021804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005455 (or 10005453 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 40021804 is about 6326.2788430483. The cubic root of 40021804 is about 342.0573185737.

Adding to 40021804 its reverse (40812004), we get a palindrome (80833808).

The spelling of 40021804 in words is "forty million, twenty-one thousand, eight hundred four".