3927720385 has 8 divisors (see below), whose sum is σ = 4840650216. Its totient is φ = 3057252480.

The previous prime is 3927720361. The next prime is 3927720403. The reversal of 3927720385 is 5830277293.

It can be written as a sum of positive squares in 4 ways, for example, as 586995984 + 3340724401 = 24228^2 + 57799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3927720385 - 2⁵ = 3927720353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10615276 + ... + 10615645.

It is an arithmetic number, because the mean of its divisors is an integer number (605081277).

Almost surely, 2^3927720385 is an apocalyptic number.

It is an amenable number.

3927720385 is a deficient number, since it is larger than the sum of its proper divisors (912929831).

3927720385 is a wasteful number, since it uses less digits than its factorization.

3927720385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21230963.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 3927720385 is about 62671.5277059687. The cubic root of 3927720385 is about 1577.7814808602.

The spelling of 3927720385 in words is "three billion, nine hundred twenty-seven million, seven hundred twenty thousand, three hundred eighty-five".