4013644 has 6 divisors (see below), whose sum is σ = 7023884. Its totient is φ = 2006820.

The previous prime is 4013641. The next prime is 4013651. The reversal of 4013644 is 4463104.

It is a happy number.

It is a super-2 number, since 2×4013644² = 32218676317472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4013641) 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 as a sum of consecutive naturals, namely, 501702 + ... + 501709.

Almost surely, 2^4013644 is an apocalyptic number.

It is an amenable number.

4013644 is a deficient number, since it is larger than the sum of its proper divisors (3010240).

4013644 is a wasteful number, since it uses less digits than its factorization.

4013644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003415 (or 1003413 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 4013644 is about 2003.4080962200. The cubic root of 4013644 is about 158.9203878701.

Adding to 4013644 its reverse (4463104), we get a palindrome (8476748).

The spelling of 4013644 in words is "four million, thirteen thousand, six hundred forty-four".