3921016399 has 2 divisors, whose sum is σ = 3921016400. Its totient is φ = 3921016398.

The previous prime is 3921016387. The next prime is 3921016433. The reversal of 3921016399 is 9936101293.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3921016399 - 2⁵ = 3921016367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921016349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960508199 + 1960508200.

It is an arithmetic number, because the mean of its divisors is an integer number (1960508200).

Almost surely, 2^3921016399 is an apocalyptic number.

3921016399 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921016399 is an equidigital number, since it uses as much as digits as its factorization.

3921016399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 3921016399 is about 62618.0197626849. The cubic root of 3921016399 is about 1576.8832967041.

The spelling of 3921016399 in words is "three billion, nine hundred twenty-one million, sixteen thousand, three hundred ninety-nine".