1646849 has 2 divisors, whose sum is σ = 1646850. Its totient is φ = 1646848.

The previous prime is 1646839. The next prime is 1646861. The reversal of 1646849 is 9486461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1575025 + 71824 = 1255^2 + 268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646849 is a prime.

It is a super-2 number, since 2×1646849² = 5424223257602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1646819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823424 + 823425.

It is an arithmetic number, because the mean of its divisors is an integer number (823425).

2^1646849 is an apocalyptic number.

It is an amenable number.

1646849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646849 is an equidigital number, since it uses as much as digits as its factorization.

1646849 is an evil number, because the sum of its binary digits is even.

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

The square root of 1646849 is about 1283.2961466474. The cubic root of 1646849 is about 118.0913063295.

The spelling of 1646849 in words is "one million, six hundred forty-six thousand, eight hundred forty-nine".