3956801987 has 4 divisors (see below), whose sum is σ = 4128836880. Its totient is φ = 3784767096.

The previous prime is 3956801977. The next prime is 3956802007. The reversal of 3956801987 is 7891086593.

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 3956801987 - 2⁶ = 3956801923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3956801977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86017412 + ... + 86017457.

It is an arithmetic number, because the mean of its divisors is an integer number (1032209220).

Almost surely, 2^3956801987 is an apocalyptic number.

3956801987 is a deficient number, since it is larger than the sum of its proper divisors (172034893).

3956801987 is a wasteful number, since it uses less digits than its factorization.

3956801987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172034892.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The square root of 3956801987 is about 62903.1158767195. The cubic root of 3956801987 is about 1581.6659758881.

The spelling of 3956801987 in words is "three billion, nine hundred fifty-six million, eight hundred one thousand, nine hundred eighty-seven".