808978 has 4 divisors (see below), whose sum is σ = 1213470. Its totient is φ = 404488.

The previous prime is 808961. The next prime is 808981. The reversal of 808978 is 879808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 734449 + 74529 = 857^2 + 273^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 808978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202243 + ... + 202246.

2⁸⁰⁸⁹⁷⁸ is an apocalyptic number.

808978 is a deficient number, since it is larger than the sum of its proper divisors (404492).

808978 is a wasteful number, since it uses less digits than its factorization.

808978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404491.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 808978 is about 899.4320430138. The cubic root of 808978 is about 93.1777538436.

The spelling of 808978 in words is "eight hundred eight thousand, nine hundred seventy-eight".