7884766921 has 2 divisors, whose sum is σ = 7884766922. Its totient is φ = 7884766920.

The previous prime is 7884766871. The next prime is 7884766961. The reversal of 7884766921 is 1296674887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7321369225 + 563397696 = 85565^2 + 23736^2 .

It is a cyclic number.

It is not a de Polignac number, because 7884766921 - 2¹⁷ = 7884635849 is a prime.

It is not a weakly prime, because it can be changed into another prime (7884766961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3942383460 + 3942383461.

It is an arithmetic number, because the mean of its divisors is an integer number (3942383461).

Almost surely, 2^7884766921 is an apocalyptic number.

It is an amenable number.

7884766921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7884766921 is an equidigital number, since it uses as much as digits as its factorization.

7884766921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 58.

The square root of 7884766921 is about 88796.2100598894. The cubic root of 7884766921 is about 1990.3507644112.

The spelling of 7884766921 in words is "seven billion, eight hundred eighty-four million, seven hundred sixty-six thousand, nine hundred twenty-one".