1646349 has 4 divisors (see below), whose sum is σ = 2195136. Its totient is φ = 1097564.

The previous prime is 1646347. The next prime is 1646357. The reversal of 1646349 is 9436461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9436461 = 3 ⋅3145487.

It is a cyclic number.

It is not a de Polignac number, because 1646349 - 2¹ = 1646347 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274389 + ... + 274394.

It is an arithmetic number, because the mean of its divisors is an integer number (548784).

2^1646349 is an apocalyptic number.

It is an amenable number.

1646349 is a deficient number, since it is larger than the sum of its proper divisors (548787).

1646349 is an equidigital number, since it uses as much as digits as its factorization.

1646349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548786.

The product of its digits is 15552, while the sum is 33.

The square root of 1646349 is about 1283.1013210187. The cubic root of 1646349 is about 118.0793538818.

The spelling of 1646349 in words is "one million, six hundred forty-six thousand, three hundred forty-nine".