1649864 has 8 divisors (see below), whose sum is σ = 3093510. Its totient is φ = 824928.

The previous prime is 1649863. The next prime is 1649887. The reversal of 1649864 is 4689461.

It can be written as a sum of positive squares in only one way, i.e., 940900 + 708964 = 970^2 + 842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1649861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103109 + ... + 103124.

2^1649864 is an apocalyptic number.

It is an amenable number.

1649864 is a deficient number, since it is larger than the sum of its proper divisors (1443646).

1649864 is a wasteful number, since it uses less digits than its factorization.

1649864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206239 (or 206235 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 1649864 is about 1284.4703188474. The cubic root of 1649864 is about 118.1633283607.

The spelling of 1649864 in words is "one million, six hundred forty-nine thousand, eight hundred sixty-four".