1646449 has 6 divisors (see below), whose sum is σ = 1915314. Its totient is φ = 1411200.

The previous prime is 1646443. The next prime is 1646461. The reversal of 1646449 is 9446461.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 753424 = 945^2 + 868^2 .

It is not a de Polignac number, because 1646449 - 2⁷ = 1646321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16752 + ... + 16849.

It is an arithmetic number, because the mean of its divisors is an integer number (319219).

2^1646449 is an apocalyptic number.

It is an amenable number.

1646449 is a deficient number, since it is larger than the sum of its proper divisors (268865).

1646449 is an equidigital number, since it uses as much as digits as its factorization.

1646449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33615 (or 33608 counting only the distinct ones).

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

The square root of 1646449 is about 1283.1402885110. The cubic root of 1646449 is about 118.0817445649.

The spelling of 1646449 in words is "one million, six hundred forty-six thousand, four hundred forty-nine".