7894325921 has 4 divisors (see below), whose sum is σ = 8358698052. Its totient is φ = 7429953792.

The previous prime is 7894325851. The next prime is 7894325927. The reversal of 7894325921 is 1295234987.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5751098896 + 2143227025 = 75836^2 + 46295^2 .

It is a cyclic number.

It is not a de Polignac number, because 7894325921 - 2¹⁴ = 7894309537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7894325921.

It is not an unprimeable number, because it can be changed into a prime (7894325927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232186040 + ... + 232186073.

It is an arithmetic number, because the mean of its divisors is an integer number (2089674513).

Almost surely, 2^7894325921 is an apocalyptic number.

It is an amenable number.

7894325921 is a deficient number, since it is larger than the sum of its proper divisors (464372131).

7894325921 is a wasteful number, since it uses less digits than its factorization.

7894325921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464372130.

The product of its digits is 1088640, while the sum is 50.

The square root of 7894325921 is about 88850.0192515455. The cubic root of 7894325921 is about 1991.1547653314.

The spelling of 7894325921 in words is "seven billion, eight hundred ninety-four million, three hundred twenty-five thousand, nine hundred twenty-one".