1791728047 has 4 divisors (see below), whose sum is σ = 1791858496. Its totient is φ = 1791597600.

The previous prime is 1791728041. The next prime is 1791728053. The reversal of 1791728047 is 7408271971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7408271971 = 7229 ⋅1024799.

It is an interprime number because it is at equal distance from previous prime (1791728041) and next prime (1791728053).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1791728047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1791727988 and 1791728006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1791728041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 41823 + ... + 73024.

It is an arithmetic number, because the mean of its divisors is an integer number (447964624).

Almost surely, 2^1791728047 is an apocalyptic number.

1791728047 is a deficient number, since it is larger than the sum of its proper divisors (130449).

1791728047 is a wasteful number, since it uses less digits than its factorization.

1791728047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130448.

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 1791728047 is about 42328.8087122707. The cubic root of 1791728047 is about 1214.5741414840.

The spelling of 1791728047 in words is "one billion, seven hundred ninety-one million, seven hundred twenty-eight thousand, forty-seven".