1649644 has 6 divisors (see below), whose sum is σ = 2886884. Its totient is φ = 824820.

The previous prime is 1649639. The next prime is 1649647. The reversal of 1649644 is 4469461.

It is not an unprimeable number, because it can be changed into a prime (1649647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206202 + ... + 206209.

2^1649644 is an apocalyptic number.

It is an amenable number.

1649644 is a deficient number, since it is larger than the sum of its proper divisors (1237240).

1649644 is a wasteful number, since it uses less digits than its factorization.

1649644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412415 (or 412413 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 1649644 is about 1284.3846775791. The cubic root of 1649644 is about 118.1580759909.

The spelling of 1649644 in words is "one million, six hundred forty-nine thousand, six hundred forty-four".