819194772 has 96 divisors (see below), whose sum is σ = 2222567424. Its totient is φ = 232355200.

The previous prime is 819194771. The next prime is 819194777. The reversal of 819194772 is 277491918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819194771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139822 + ... + 145562.

It is an arithmetic number, because the mean of its divisors is an integer number (23151744).

Almost surely, 2^819194772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 819194772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111283712).

819194772 is an abundant number, since it is smaller than the sum of its proper divisors (1403372652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819194772 is a wasteful number, since it uses less digits than its factorization.

819194772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5829 (or 5827 counting only the distinct ones).

The product of its digits is 254016, while the sum is 48.

The square root of 819194772 is about 28621.5787824501. The cubic root of 819194772 is about 935.6836857597.

It can be divided in two parts, 819 and 194772, that added together give a palindrome (195591).

The spelling of 819194772 in words is "eight hundred nineteen million, one hundred ninety-four thousand, seven hundred seventy-two".