1978826 has 8 divisors (see below), whose sum is σ = 3001860. Its totient is φ = 978208.

The previous prime is 1978807. The next prime is 1978849. The reversal of 1978826 is 6288791.

It can be written as a sum of positive squares in 2 ways, for example, as 1692601 + 286225 = 1301^2 + 535^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 5381 + ... + 5736.

2^1978826 is an apocalyptic number.

1978826 is a deficient number, since it is larger than the sum of its proper divisors (1023034).

1978826 is a wasteful number, since it uses less digits than its factorization.

1978826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11208.

The product of its digits is 48384, while the sum is 41.

The square root of 1978826 is about 1406.7075033567. The cubic root of 1978826 is about 125.5459004709.

The spelling of 1978826 in words is "one million, nine hundred seventy-eight thousand, eight hundred twenty-six".