1945644 has 24 divisors (see below), whose sum is σ = 4563888. Its totient is φ = 645120.

The previous prime is 1945637. The next prime is 1945649. The reversal of 1945644 is 4465491.

It is not an unprimeable number, because it can be changed into a prime (1945649) 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, 3084 + ... + 3660.

It is an arithmetic number, because the mean of its divisors is an integer number (190162).

2^1945644 is an apocalyptic number.

It is an amenable number.

1945644 is an abundant number, since it is smaller than the sum of its proper divisors (2618244).

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

1945644 is a wasteful number, since it uses less digits than its factorization.

1945644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 863 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 1945644 is about 1394.8634341755. The cubic root of 1945644 is about 124.8402011350.

The spelling of 1945644 in words is "one million, nine hundred forty-five thousand, six hundred forty-four".