4021604 has 24 divisors (see below), whose sum is σ = 7485240. Its totient is φ = 1886976.

The previous prime is 4021601. The next prime is 4021607. The reversal of 4021604 is 4061204.

It is an interprime number because it is at equal distance from previous prime (4021601) and next prime (4021607).

It can be written as a sum of positive squares in 4 ways, for example, as 487204 + 3534400 = 698^2 + 1880^2 .

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021601) 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 7 ways as a sum of consecutive naturals, for example, 3824 + ... + 4760.

It is an arithmetic number, because the mean of its divisors is an integer number (311885).

Almost surely, 2^4021604 is an apocalyptic number.

It is an amenable number.

4021604 is a deficient number, since it is larger than the sum of its proper divisors (3463636).

4021604 is a wasteful number, since it uses less digits than its factorization.

4021604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007 (or 1005 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 4021604 is about 2005.3937269275. The cubic root of 4021604 is about 159.0253773294.

Adding to 4021604 its reverse (4061204), we get a palindrome (8082808).

The spelling of 4021604 in words is "four million, twenty-one thousand, six hundred four".