803778979 has 4 divisors (see below), whose sum is σ = 803942920. Its totient is φ = 803615040.

The previous prime is 803778961. The next prime is 803778991. The reversal of 803778979 is 979877308.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 803778979 - 2⁵ = 803778947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (803778929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74382 + ... + 84499.

It is an arithmetic number, because the mean of its divisors is an integer number (200985730).

Almost surely, 2^803778979 is an apocalyptic number.

803778979 is a deficient number, since it is larger than the sum of its proper divisors (163941).

803778979 is a wasteful number, since it uses less digits than its factorization.

803778979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163940.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The square root of 803778979 is about 28350.9960847939. The cubic root of 803778979 is about 929.7771767399. Note that the first 3 decimals are identical.

The spelling of 803778979 in words is "eight hundred three million, seven hundred seventy-eight thousand, nine hundred seventy-nine".