1978944 has 56 divisors (see below), whose sum is σ = 5718048. Its totient is φ = 599040.

The previous prime is 1978927. The next prime is 1978981. The reversal of 1978944 is 4498791.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 1978896 and 1978905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1644 + ... + 2580.

It is an arithmetic number, because the mean of its divisors is an integer number (102108).

2^1978944 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 1978944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2859024).

1978944 is an abundant number, since it is smaller than the sum of its proper divisors (3739104).

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

1978944 is a wasteful number, since it uses less digits than its factorization.

1978944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 953 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 1978944 is about 1406.7494446418. The cubic root of 1978944 is about 125.5483959104.

The spelling of 1978944 in words is "one million, nine hundred seventy-eight thousand, nine hundred forty-four".