1978544 has 20 divisors (see below), whose sum is σ = 3958080. Its totient is φ = 957120.

The previous prime is 1978541. The next prime is 1978567. The reversal of 1978544 is 4458791.

1978544 = T₂₂₁ + T₂₂₂ + ... + T₂₈₂.

1978544 is an admirable number.

It is a d-powerful number, because it can be written as 1 + 9⁴ + 7⁴ + 8 + 5⁹ + 4³ + 4⁷ .

It is a junction number, because it is equal to n+sod(n) for n = 1978498 and 1978507.

It is not an unprimeable number, because it can be changed into a prime (1978541) 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, 1499 + ... + 2490.

It is an arithmetic number, because the mean of its divisors is an integer number (197904).

2^1978544 is an apocalyptic number.

It is an amenable number.

1978544 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1978544 is a wasteful number, since it uses less digits than its factorization.

1978544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028 (or 4022 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 1978544 is about 1406.6072657284. The cubic root of 1978544 is about 125.5399363915.

It can be divided in two parts, 19785 and 44, that multiplied together give a triangular number (870540 = T₁₃₁₉).

The spelling of 1978544 in words is "one million, nine hundred seventy-eight thousand, five hundred forty-four".