1978825 has 6 divisors (see below), whose sum is σ = 2453774. Its totient is φ = 1583040.

The previous prime is 1978807. The next prime is 1978849. The reversal of 1978825 is 5288791.

It can be written as a sum of positive squares in 3 ways, for example, as 299209 + 1679616 = 547^2 + 1296^2 .

It is not a de Polignac number, because 1978825 - 2⁹ = 1978313 is a prime.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 39552 + ... + 39601.

2^1978825 is an apocalyptic number.

It is an amenable number.

1978825 is a deficient number, since it is larger than the sum of its proper divisors (474949).

1978825 is an equidigital number, since it uses as much as digits as its factorization.

1978825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79163 (or 79158 counting only the distinct ones).

The product of its digits is 40320, while the sum is 40.

The square root of 1978825 is about 1406.7071479167. The cubic root of 1978825 is about 125.5458793226.

The spelling of 1978825 in words is "one million, nine hundred seventy-eight thousand, eight hundred twenty-five".