3881720001 has 4 divisors (see below), whose sum is σ = 5175626672. Its totient is φ = 2587813332.

The previous prime is 3881719997. The next prime is 3881720047. The reversal of 3881720001 is 1000271883.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3881720001 - 2² = 3881719997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3881720071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646953331 + ... + 646953336.

It is an arithmetic number, because the mean of its divisors is an integer number (1293906668).

Almost surely, 2^3881720001 is an apocalyptic number.

It is an amenable number.

3881720001 is a deficient number, since it is larger than the sum of its proper divisors (1293906671).

3881720001 is a wasteful number, since it uses less digits than its factorization.

3881720001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293906670.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 3881720001 is about 62303.4509557857. The cubic root of 3881720001 is about 1571.5977623195.

Adding to 3881720001 its reverse (1000271883), we get a palindrome (4881991884).

The spelling of 3881720001 in words is "three billion, eight hundred eighty-one million, seven hundred twenty thousand, one".