4380756721 has 12 divisors (see below), whose sum is σ = 4851986832. Its totient is φ = 3952091000.

The previous prime is 4380756703. The next prime is 4380756739. The reversal of 4380756721 is 1276570834.

It is an interprime number because it is at equal distance from previous prime (4380756703) and next prime (4380756739).

It is not a de Polignac number, because 4380756721 - 2⁹ = 4380756209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4380756421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122335 + ... + 154036.

It is an arithmetic number, because the mean of its divisors is an integer number (404332236).

Almost surely, 2^4380756721 is an apocalyptic number.

It is an amenable number.

4380756721 is a deficient number, since it is larger than the sum of its proper divisors (471230111).

4380756721 is a wasteful number, since it uses less digits than its factorization.

4380756721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276524 (or 276513 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 4380756721 is about 66187.2851913417. The cubic root of 4380756721 is about 1636.2501974907.

The spelling of 4380756721 in words is "four billion, three hundred eighty million, seven hundred fifty-six thousand, seven hundred twenty-one".