873790721 has 2 divisors, whose sum is σ = 873790722. Its totient is φ = 873790720.

The previous prime is 873790711. The next prime is 873790727. The reversal of 873790721 is 127097378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 747475600 + 126315121 = 27340^2 + 11239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-873790721 is a prime.

It is not a weakly prime, because it can be changed into another prime (873790727) 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, 436895360 + 436895361.

It is an arithmetic number, because the mean of its divisors is an integer number (436895361).

Almost surely, 2^873790721 is an apocalyptic number.

It is an amenable number.

873790721 is a deficient number, since it is larger than the sum of its proper divisors (1).

873790721 is an equidigital number, since it uses as much as digits as its factorization.

873790721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 44.

The square root of 873790721 is about 29559.9513023956. The cubic root of 873790721 is about 956.0247658629.

The spelling of 873790721 in words is "eight hundred seventy-three million, seven hundred ninety thousand, seven hundred twenty-one".