1661244 has 48 divisors (see below), whose sum is σ = 4365312. Its totient is φ = 487872.

The previous prime is 1661243. The next prime is 1661249. The reversal of 1661244 is 4421661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661243) 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 15 ways as a sum of consecutive naturals, for example, 3357 + ... + 3819.

It is an arithmetic number, because the mean of its divisors is an integer number (90944).

2^1661244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2182656).

1661244 is an abundant number, since it is smaller than the sum of its proper divisors (2704068).

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

1661244 is a wasteful number, since it uses less digits than its factorization.

1661244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 504 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 1661244 is about 1288.8925478875. The cubic root of 1661244 is about 118.4343847966.

The spelling of 1661244 in words is "one million, six hundred sixty-one thousand, two hundred forty-four".