1978256 has 40 divisors (see below), whose sum is σ = 4642560. Its totient is φ = 797184.

The previous prime is 1978219. The next prime is 1978267. The reversal of 1978256 is 6528791.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1385 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (116064).

2^1978256 is an apocalyptic number.

1978256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2321280).

1978256 is an abundant number, since it is smaller than the sum of its proper divisors (2664304).

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

1978256 is a wasteful number, since it uses less digits than its factorization.

1978256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071 (or 1065 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 1978256 is about 1406.5048880114. The cubic root of 1978256 is about 125.5338448319.

The spelling of 1978256 in words is "one million, nine hundred seventy-eight thousand, two hundred fifty-six".