3921805963 has 4 divisors (see below), whose sum is σ = 3922293640. Its totient is φ = 3921318288.

The previous prime is 3921805957. The next prime is 3921805999. The reversal of 3921805963 is 3695081293.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3921805963 - 2⁵ = 3921805931 is a prime.

It is a super-2 number, since 2×3921805963² = 30761124022844714738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921805163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231570 + ... + 247927.

It is an arithmetic number, because the mean of its divisors is an integer number (980573410).

Almost surely, 2^3921805963 is an apocalyptic number.

3921805963 is a deficient number, since it is larger than the sum of its proper divisors (487677).

3921805963 is an equidigital number, since it uses as much as digits as its factorization.

3921805963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487676.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 3921805963 is about 62624.3240522403. The cubic root of 3921805963 is about 1576.9891337792.

The spelling of 3921805963 in words is "three billion, nine hundred twenty-one million, eight hundred five thousand, nine hundred sixty-three".