784710733921 has 3 divisors (see below), whose sum is σ = 784711619761. Its totient is φ = 784709848082.

The previous prime is 784710733837. The next prime is 784710733927. The reversal of 784710733921 is 129337017487.

The square root of 784710733921 is 885839.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 129337017487 = 131 ⋅987305477.

It is not a de Polignac number, because 784710733921 - 2²¹ = 784708636769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (784710733927) 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 2 ways as a sum of consecutive naturals, for example, 442920 + ... + 1328758.

Almost surely, 2^784710733921 is an apocalyptic number.

784710733921 is the 885839-th square number.

784710733921 is the 442920-th centered octagonal number.

It is an amenable number.

784710733921 is a deficient number, since it is larger than the sum of its proper divisors (885840).

784710733921 is an frugal number, since it uses more digits than its factorization.

784710733921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771678 (or 885839 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 784710733921 in words is "seven hundred eighty-four billion, seven hundred ten million, seven hundred thirty-three thousand, nine hundred twenty-one".