819270742 has 4 divisors (see below), whose sum is σ = 1228906116. Its totient is φ = 409635370.

The previous prime is 819270719. The next prime is 819270743. The reversal of 819270742 is 247072918.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 819270695 and 819270704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819270743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204817684 + ... + 204817687.

It is an arithmetic number, because the mean of its divisors is an integer number (307226529).

Almost surely, 2^819270742 is an apocalyptic number.

819270742 is a deficient number, since it is larger than the sum of its proper divisors (409635374).

819270742 is a wasteful number, since it uses less digits than its factorization.

819270742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409635373.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 819270742 is about 28622.9058972006. The cubic root of 819270742 is about 935.7126091590.

The spelling of 819270742 in words is "eight hundred nineteen million, two hundred seventy thousand, seven hundred forty-two".