1646842 has 4 divisors (see below), whose sum is σ = 2470266. Its totient is φ = 823420.

The previous prime is 1646839. The next prime is 1646849. The reversal of 1646842 is 2486461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2486461 = 23 ⋅108107.

It can be written as a sum of positive squares in only one way, i.e., 1610361 + 36481 = 1269^2 + 191^2 .

It is not an unprimeable number, because it can be changed into a prime (1646849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411709 + ... + 411712.

2^1646842 is an apocalyptic number.

1646842 is a deficient number, since it is larger than the sum of its proper divisors (823424).

1646842 is an equidigital number, since it uses as much as digits as its factorization.

1646842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823423.

The product of its digits is 9216, while the sum is 31.

The square root of 1646842 is about 1283.2934192927. The cubic root of 1646842 is about 118.0911390119.

The spelling of 1646842 in words is "one million, six hundred forty-six thousand, eight hundred forty-two".