1663822 has 4 divisors (see below), whose sum is σ = 2495736. Its totient is φ = 831910.

The previous prime is 1663813. The next prime is 1663861. The reversal of 1663822 is 2283661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2283661 = 17 ⋅134333.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 415954 + ... + 415957.

It is an arithmetic number, because the mean of its divisors is an integer number (623934).

2^1663822 is an apocalyptic number.

1663822 is a deficient number, since it is larger than the sum of its proper divisors (831914).

1663822 is an equidigital number, since it uses as much as digits as its factorization.

1663822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831913.

The product of its digits is 3456, while the sum is 28.

The square root of 1663822 is about 1289.8922435615. The cubic root of 1663822 is about 118.4956172307.

It can be divided in two parts, 1663 and 822, that added together give a triangular number (2485 = T₇₀).

The spelling of 1663822 in words is "one million, six hundred sixty-three thousand, eight hundred twenty-two".