823978 has 8 divisors (see below), whose sum is σ = 1243872. Its totient is φ = 409356.

The previous prime is 823969. The next prime is 823981. The reversal of 823978 is 879328.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900 + ... + 1567.

It is an arithmetic number, because the mean of its divisors is an integer number (155484).

2⁸²³⁹⁷⁸ is an apocalyptic number.

823978 is a deficient number, since it is larger than the sum of its proper divisors (419894).

823978 is a wasteful number, since it uses less digits than its factorization.

823978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636.

The product of its digits is 24192, while the sum is 37.

The square root of 823978 is about 907.7323394041. The cubic root of 823978 is about 93.7501285924.

The spelling of 823978 in words is "eight hundred twenty-three thousand, nine hundred seventy-eight".