1661144 has 8 divisors (see below), whose sum is σ = 3114660. Its totient is φ = 830568.

The previous prime is 1661141. The next prime is 1661159. The reversal of 1661144 is 4411661.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103814 + ... + 103829.

2^1661144 is an apocalyptic number.

It is an amenable number.

1661144 is a deficient number, since it is larger than the sum of its proper divisors (1453516).

1661144 is a wasteful number, since it uses less digits than its factorization.

1661144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207649 (or 207645 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 1661144 is about 1288.8537543104. The cubic root of 1661144 is about 118.4320083293.

The spelling of 1661144 in words is "one million, six hundred sixty-one thousand, one hundred forty-four".