1661444 has 24 divisors (see below), whose sum is σ = 3143448. Its totient is φ = 765440.

The previous prime is 1661441. The next prime is 1661447. The reversal of 1661444 is 4441661.

It is an interprime number because it is at equal distance from previous prime (1661441) and next prime (1661447).

It can be written as a sum of positive squares in 4 ways, for example, as 473344 + 1188100 = 688^2 + 1090^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661441) 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, 3374 + ... + 3834.

It is an arithmetic number, because the mean of its divisors is an integer number (130977).

2^1661444 is an apocalyptic number.

It is an amenable number.

1661444 is a deficient number, since it is larger than the sum of its proper divisors (1482004).

1661444 is a wasteful number, since it uses less digits than its factorization.

1661444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 533 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 1661444 is about 1288.9701315391. The cubic root of 1661444 is about 118.4391374451.

The spelling of 1661444 in words is "one million, six hundred sixty-one thousand, four hundred forty-four".