4040028 has 18 divisors (see below), whose sum is σ = 10212384. Its totient is φ = 1346664.

The previous prime is 4040021. The next prime is 4040041. The reversal of 4040028 is 8200404.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4040021) 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 5 ways as a sum of consecutive naturals, for example, 56076 + ... + 56147.

Almost surely, 2^4040028 is an apocalyptic number.

It is an amenable number.

4040028 is an abundant number, since it is smaller than the sum of its proper divisors (6172356).

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

4040028 is a wasteful number, since it uses less digits than its factorization.

4040028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112233 (or 112228 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 4040028 is about 2009.9820894724. The cubic root of 4040028 is about 159.2678527796.

The spelling of 4040028 in words is "four million, forty thousand, twenty-eight".