1644013 has 16 divisors (see below), whose sum is σ = 2027520. Its totient is φ = 1301616.

The previous prime is 1644001. The next prime is 1644031. The reversal of 1644013 is 3104461.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1644013 - 2⁹ = 1643501 is a prime.

It is a super-3 number, since 3×1644013³ = 13330210174612530591, which contains 333 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6120 + ... + 6382.

It is an arithmetic number, because the mean of its divisors is an integer number (126720).

2^1644013 is an apocalyptic number.

It is an amenable number.

1644013 is a deficient number, since it is larger than the sum of its proper divisors (383507).

1644013 is a wasteful number, since it uses less digits than its factorization.

1644013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1644013 is about 1282.1907034447. The cubic root of 1644013 is about 118.0234799584.

Adding to 1644013 its reverse (3104461), we get a palindrome (4748474).

The spelling of 1644013 in words is "one million, six hundred forty-four thousand, thirteen".