3906091987 has 6 divisors (see below), whose sum is σ = 4543821348. Its totient is φ = 3348078804.

The previous prime is 3906091963. The next prime is 3906091999. The reversal of 3906091987 is 7891906093.

It is not a de Polignac number, because 3906091987 - 2⁷ = 3906091859 is a prime.

It is a super-2 number, since 2×3906091987² = 30515109221811216338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3906091187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39858033 + ... + 39858130.

It is an arithmetic number, because the mean of its divisors is an integer number (757303558).

Almost surely, 2^3906091987 is an apocalyptic number.

3906091987 is a deficient number, since it is larger than the sum of its proper divisors (637729361).

3906091987 is an equidigital number, since it uses as much as digits as its factorization.

3906091987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79716177 (or 79716170 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 3906091987 is about 62498.7358832161. The cubic root of 3906091987 is about 1574.8800764657.

The spelling of 3906091987 in words is "three billion, nine hundred six million, ninety-one thousand, nine hundred eighty-seven".