1978338 has 8 divisors (see below), whose sum is σ = 3956688. Its totient is φ = 659444.

The previous prime is 1978313. The next prime is 1978343. The reversal of 1978338 is 8338791.

It is a sphenic number, since it is the product of 3 distinct primes.

1978338 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1978296 and 1978305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164856 + ... + 164867.

It is an arithmetic number, because the mean of its divisors is an integer number (494586).

2^1978338 is an apocalyptic number.

1978338 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.

1978338 is a wasteful number, since it uses less digits than its factorization.

1978338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329728.

The product of its digits is 36288, while the sum is 39.

The square root of 1978338 is about 1406.5340379813. The cubic root of 1978338 is about 125.5355792945.

The spelling of 1978338 in words is "one million, nine hundred seventy-eight thousand, three hundred thirty-eight".