1663662 has 64 divisors (see below), whose sum is σ = 4483584. Its totient is φ = 397440.

The previous prime is 1663619. The next prime is 1663681. The reversal of 1663662 is 2663661.

It is a nude number because it is divisible by every one of its digits.

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 in 31 ways as a sum of consecutive naturals, for example, 5868 + ... + 6144.

It is an arithmetic number, because the mean of its divisors is an integer number (70056).

2^1663662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2241792).

1663662 is an abundant number, since it is smaller than the sum of its proper divisors (2819922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663662 is a wasteful number, since it uses less digits than its factorization.

1663662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its digits is 7776, while the sum is 30.

The square root of 1663662 is about 1289.8302213857. The cubic root of 1663662 is about 118.4918187661.

Subtracting 1663662 from its reverse (2663661), we obtain a palindrome (999999).

It can be divided in two parts, 166 and 3662, that added together give a triangular number (3828 = T₈₇).

The spelling of 1663662 in words is "one million, six hundred sixty-three thousand, six hundred sixty-two".