1649646 has 40 divisors (see below), whose sum is σ = 3920400. Its totient is φ = 516672.

The previous prime is 1649639. The next prime is 1649647. The reversal of 1649646 is 6469461.

1649646 is a `hidden beast` number, since 1 + 6 + 4 + 9 + 646 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1649646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649647) 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 19 ways as a sum of consecutive naturals, for example, 2455 + ... + 3053.

It is an arithmetic number, because the mean of its divisors is an integer number (98010).

2^1649646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1960200).

1649646 is an abundant number, since it is smaller than the sum of its proper divisors (2270754).

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

1649646 is a wasteful number, since it uses less digits than its factorization.

1649646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 621 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1649646 is about 1284.3854561618. The cubic root of 1649646 is about 118.1581237418.

The spelling of 1649646 in words is "one million, six hundred forty-nine thousand, six hundred forty-six".