1662444 has 60 divisors (see below), whose sum is σ = 4973584. Its totient is φ = 474336.

The previous prime is 1662439. The next prime is 1662449. The reversal of 1662444 is 4442661.

It is an interprime number because it is at equal distance from previous prime (1662439) and next prime (1662449).

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is not an unprimeable number, because it can be changed into a prime (1662449) 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 in 19 ways as a sum of consecutive naturals, for example, 1902 + ... + 2634.

2^1662444 is an apocalyptic number.

1662444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1662444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486792).

1662444 is an abundant number, since it is smaller than the sum of its proper divisors (3311140).

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

1662444 is a wasteful number, since it uses less digits than its factorization.

1662444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 745 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 1662444 is about 1289.3579797713. The cubic root of 1662444 is about 118.4628949683.

The spelling of 1662444 in words is "one million, six hundred sixty-two thousand, four hundred forty-four".