1644606 has 12 divisors (see below), whose sum is σ = 3563352. Its totient is φ = 548196.

The previous prime is 1644593. The next prime is 1644607. The reversal of 1644606 is 6064461.

1644606 is a `hidden beast` number, since 16 + 44 + 606 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1644606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45666 + ... + 45701.

It is an arithmetic number, because the mean of its divisors is an integer number (296946).

2^1644606 is an apocalyptic number.

1644606 is an abundant number, since it is smaller than the sum of its proper divisors (1918746).

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

1644606 is a wasteful number, since it uses less digits than its factorization.

1644606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91375 (or 91372 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1644606 is about 1282.4219274482. The cubic root of 1644606 is about 118.0376687170.

The spelling of 1644606 in words is "one million, six hundred forty-four thousand, six hundred six".