3905680321 has 2 divisors, whose sum is σ = 3905680322. Its totient is φ = 3905680320.

The previous prime is 3905680313. The next prime is 3905680369. The reversal of 3905680321 is 1230865093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2504001600 + 1401678721 = 50040^2 + 37439^2 .

It is a cyclic number.

It is not a de Polignac number, because 3905680321 - 2³ = 3905680313 is a prime.

It is not a weakly prime, because it can be changed into another prime (3905680621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1952840160 + 1952840161.

It is an arithmetic number, because the mean of its divisors is an integer number (1952840161).

Almost surely, 2^3905680321 is an apocalyptic number.

It is an amenable number.

3905680321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3905680321 is an equidigital number, since it uses as much as digits as its factorization.

3905680321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 3905680321 is about 62495.4424018264. The cubic root of 3905680321 is about 1574.8247485864.

The spelling of 3905680321 in words is "three billion, nine hundred five million, six hundred eighty thousand, three hundred twenty-one".