1662144 has 56 divisors (see below), whose sum is σ = 4803648. Its totient is φ = 503040.

The previous prime is 1662121. The next prime is 1662149. The reversal of 1662144 is 4412661.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 (1662149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1719 + ... + 2505.

2^1662144 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 1662144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2401824).

1662144 is an abundant number, since it is smaller than the sum of its proper divisors (3141504).

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

1662144 is a wasteful number, since it uses less digits than its factorization.

1662144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813 (or 803 counting only the distinct ones).

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

The square root of 1662144 is about 1289.2416375529. The cubic root of 1662144 is about 118.4557687119.

The spelling of 1662144 in words is "one million, six hundred sixty-two thousand, one hundred forty-four".