4380788921 has 2 divisors, whose sum is σ = 4380788922. Its totient is φ = 4380788920.

The previous prime is 4380788917. The next prime is 4380788953. The reversal of 4380788921 is 1298870834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3913753600 + 467035321 = 62560^2 + 21611^2 .

It is a cyclic number.

It is not a de Polignac number, because 4380788921 - 2² = 4380788917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4380788921.

It is not a weakly prime, because it can be changed into another prime (4380788221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2190394460 + 2190394461.

It is an arithmetic number, because the mean of its divisors is an integer number (2190394461).

Almost surely, 2^4380788921 is an apocalyptic number.

It is an amenable number.

4380788921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4380788921 is an equidigital number, since it uses as much as digits as its factorization.

4380788921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 4380788921 is about 66187.5284400317. The cubic root of 4380788921 is about 1636.2542064729.

The spelling of 4380788921 in words is "four billion, three hundred eighty million, seven hundred eighty-eight thousand, nine hundred twenty-one".