1944661 has 4 divisors (see below), whose sum is σ = 2007424. Its totient is φ = 1881900.

The previous prime is 1944659. The next prime is 1944667. The reversal of 1944661 is 1664491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1664491 = 619 ⋅2689.

It is a cyclic number.

It is not a de Polignac number, because 1944661 - 2¹ = 1944659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 62731 = 1944661 / (1 + 9 + 4 + 4 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31335 + ... + 31396.

It is an arithmetic number, because the mean of its divisors is an integer number (501856).

2^1944661 is an apocalyptic number.

It is an amenable number.

1944661 is a deficient number, since it is larger than the sum of its proper divisors (62763).

1944661 is an equidigital number, since it uses as much as digits as its factorization.

1944661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62762.

The product of its digits is 5184, while the sum is 31.

The square root of 1944661 is about 1394.5110254136. The cubic root of 1944661 is about 124.8191732062.

The spelling of 1944661 in words is "one million, nine hundred forty-four thousand, six hundred sixty-one".