1646481 has 4 divisors (see below), whose sum is σ = 2195312. Its totient is φ = 1097652.

The previous prime is 1646479. The next prime is 1646497. The reversal of 1646481 is 1846461.

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.

It is not a de Polignac number, because 1646481 - 2¹ = 1646479 is a prime.

It is a super-2 number, since 2×1646481² = 5421799366722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646461) 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, 274411 + ... + 274416.

It is an arithmetic number, because the mean of its divisors is an integer number (548828).

2^1646481 is an apocalyptic number.

It is an amenable number.

1646481 is a deficient number, since it is larger than the sum of its proper divisors (548831).

1646481 is an equidigital number, since it uses as much as digits as its factorization.

1646481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548830.

The product of its digits is 4608, while the sum is 30.

The square root of 1646481 is about 1283.1527578585. The cubic root of 1646481 is about 118.0825095630.

The spelling of 1646481 in words is "one million, six hundred forty-six thousand, four hundred eighty-one".