3987136843 has 4 divisors (see below), whose sum is σ = 3989712400. Its totient is φ = 3984561288.

The previous prime is 3987136823. The next prime is 3987136897. The reversal of 3987136843 is 3486317893.

It is a happy number.

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 3987136843 - 2²¹ = 3985039691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3987136823) 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, 1285455 + ... + 1288552.

It is an arithmetic number, because the mean of its divisors is an integer number (997428100).

Almost surely, 2^3987136843 is an apocalyptic number.

3987136843 is a deficient number, since it is larger than the sum of its proper divisors (2575557).

3987136843 is a wasteful number, since it uses less digits than its factorization.

3987136843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575556.

The product of its digits is 2612736, while the sum is 52.

The square root of 3987136843 is about 63143.7791314394. The cubic root of 3987136843 is about 1585.6976423130.

The spelling of 3987136843 in words is "three billion, nine hundred eighty-seven million, one hundred thirty-six thousand, eight hundred forty-three".