819945274 has 16 divisors (see below), whose sum is σ = 1248703488. Its totient is φ = 403758432.

The previous prime is 819945229. The next prime is 819945299. The reversal of 819945274 is 472549918.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23017 + ... + 46579.

It is an arithmetic number, because the mean of its divisors is an integer number (78043968).

Almost surely, 2^819945274 is an apocalyptic number.

819945274 is a deficient number, since it is larger than the sum of its proper divisors (428758214).

819945274 is a wasteful number, since it uses less digits than its factorization.

819945274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23829.

The product of its digits is 725760, while the sum is 49.

The square root of 819945274 is about 28634.6865531998. The cubic root of 819945274 is about 935.9693394941.

The spelling of 819945274 in words is "eight hundred nineteen million, nine hundred forty-five thousand, two hundred seventy-four".