1662646 has 4 divisors (see below), whose sum is σ = 2493972. Its totient is φ = 831322.

The previous prime is 1662643. The next prime is 1662653. The reversal of 1662646 is 6462661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6462661 = 53 ⋅121937.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415660 + ... + 415663.

It is an arithmetic number, because the mean of its divisors is an integer number (623493).

2^1662646 is an apocalyptic number.

1662646 is a deficient number, since it is larger than the sum of its proper divisors (831326).

1662646 is an equidigital number, since it uses as much as digits as its factorization.

1662646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831325.

The product of its digits is 10368, while the sum is 31.

The square root of 1662646 is about 1289.4363109514. The cubic root of 1662646 is about 118.4676928313.

The spelling of 1662646 in words is "one million, six hundred sixty-two thousand, six hundred forty-six".