873047721 has 64 divisors (see below), whose sum is σ = 1480550400. Its totient is φ = 445395456.

The previous prime is 873047687. The next prime is 873047771. The reversal of 873047721 is 127740378.

It is not a de Polignac number, because 873047721 - 2¹⁴ = 873031337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 873047721.

It is not an unprimeable number, because it can be changed into a prime (873047771) 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 in 63 ways as a sum of consecutive naturals, for example, 1078765 + ... + 1079573.

It is an arithmetic number, because the mean of its divisors is an integer number (23133600).

Almost surely, 2^873047721 is an apocalyptic number.

It is an amenable number.

873047721 is a deficient number, since it is larger than the sum of its proper divisors (607502679).

873047721 is a wasteful number, since it uses less digits than its factorization.

873047721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958.

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 873047721 is about 29547.3809499252. The cubic root of 873047721 is about 955.7537139914.

The spelling of 873047721 in words is "eight hundred seventy-three million, forty-seven thousand, seven hundred twenty-one".