1649636 has 12 divisors (see below), whose sum is σ = 2986620. Its totient is φ = 796320.

The previous prime is 1649621. The next prime is 1649639. The reversal of 1649636 is 6369461.

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 649636 = 1000^2 + 806^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1649596 and 1649605.

It is not an unprimeable number, because it can be changed into a prime (1649639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6995 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (248885).

2^1649636 is an apocalyptic number.

It is an amenable number.

1649636 is a deficient number, since it is larger than the sum of its proper divisors (1336984).

1649636 is a wasteful number, since it uses less digits than its factorization.

1649636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14254 (or 14252 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 1649636 is about 1284.3815632436. The cubic root of 1649636 is about 118.1578849868.

The spelling of 1649636 in words is "one million, six hundred forty-nine thousand, six hundred thirty-six".