1978325 has 6 divisors (see below), whose sum is σ = 2453154. Its totient is φ = 1582640.

The previous prime is 1978313. The next prime is 1978343. The reversal of 1978325 is 5238791.

It can be written as a sum of positive squares in 3 ways, for example, as 438244 + 1540081 = 662^2 + 1241^2 .

It is not a de Polignac number, because 1978325 - 2¹⁰ = 1977301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39542 + ... + 39591.

It is an arithmetic number, because the mean of its divisors is an integer number (408859).

2^1978325 is an apocalyptic number.

It is an amenable number.

1978325 is a deficient number, since it is larger than the sum of its proper divisors (474829).

1978325 is an equidigital number, since it uses as much as digits as its factorization.

1978325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79143 (or 79138 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 1978325 is about 1406.5294166849. The cubic root of 1978325 is about 125.5353043219.

The spelling of 1978325 in words is "one million, nine hundred seventy-eight thousand, three hundred twenty-five".