3986956840 has 16 divisors (see below), whose sum is σ = 8970652980. Its totient is φ = 1594782720.

The previous prime is 3986956829. The next prime is 3986956879. The reversal of 3986956840 is 486596893.

It can be written as a sum of positive squares in 2 ways, for example, as 3198807364 + 788149476 = 56558^2 + 28074^2 .

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 3 ways as a sum of consecutive naturals, for example, 49836921 + ... + 49837000.

Almost surely, 2^3986956840 is an apocalyptic number.

It is an amenable number.

3986956840 is an abundant number, since it is smaller than the sum of its proper divisors (4983696140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3986956840 is a wasteful number, since it uses less digits than its factorization.

3986956840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99673932 (or 99673928 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The square root of 3986956840 is about 63142.3537730421. The cubic root of 3986956840 is about 1585.6737793557.

The spelling of 3986956840 in words is "three billion, nine hundred eighty-six million, nine hundred fifty-six thousand, eight hundred forty".