4004155 has 16 divisors (see below), whose sum is σ = 5116320. Its totient is φ = 2999808.

The previous prime is 4004141. The next prime is 4004179. The reversal of 4004155 is 5514004.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4004155 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

4004155 is a lucky number.

It is a congruent 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 in 15 ways as a sum of consecutive naturals, for example, 10549 + ... + 10921.

It is an arithmetic number, because the mean of its divisors is an integer number (319770).

Almost surely, 2^4004155 is an apocalyptic number.

4004155 is a deficient number, since it is larger than the sum of its proper divisors (1112165).

4004155 is a wasteful number, since it uses less digits than its factorization.

4004155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 4004155 is about 2001.0384803896. The cubic root of 4004155 is about 158.7950499380.

Adding to 4004155 its reverse (5514004), we get a palindrome (9518159).

The spelling of 4004155 in words is "four million, four thousand, one hundred fifty-five".