1649668 has 12 divisors (see below), whose sum is σ = 2898252. Its totient is φ = 821600.

The previous prime is 1649657. The next prime is 1649671. The reversal of 1649668 is 8669461.

It can be written as a sum of positive squares in 2 ways, for example, as 31684 + 1617984 = 178^2 + 1272^2 .

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1649668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618 + ... + 1918.

It is an arithmetic number, because the mean of its divisors is an integer number (241521).

2^1649668 is an apocalyptic number.

It is an amenable number.

1649668 is a deficient number, since it is larger than the sum of its proper divisors (1248584).

1649668 is a wasteful number, since it uses less digits than its factorization.

1649668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622 (or 1620 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1649668 is about 1284.3940205404. The cubic root of 1649668 is about 118.1586489994.

The spelling of 1649668 in words is "one million, six hundred forty-nine thousand, six hundred sixty-eight".