4005156 has 24 divisors (see below), whose sum is σ = 9505440. Its totient is φ = 1312192.

The previous prime is 4005137. The next prime is 4005173. The reversal of 4005156 is 6515004.

It is a happy number.

4005156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam 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, 2121 + ... + 3536.

It is an arithmetic number, because the mean of its divisors is an integer number (396060).

Almost surely, 2^4005156 is an apocalyptic number.

It is an amenable number.

4005156 is an abundant number, since it is smaller than the sum of its proper divisors (5500284).

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

4005156 is a wasteful number, since it uses less digits than its factorization.

4005156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5723 (or 5721 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 4005156 is about 2001.2885848872. The cubic root of 4005156 is about 158.8082812441.

The spelling of 4005156 in words is "four million, five thousand, one hundred fifty-six".