3859987 has 4 divisors (see below), whose sum is σ = 3993120. Its totient is φ = 3726856.

The previous prime is 3859979. The next prime is 3859993. The reversal of 3859987 is 7899583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7899583 = 97 ⋅81439.

It is a cyclic number.

It is not a de Polignac number, because 3859987 - 2³ = 3859979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3859987.

It is not an unprimeable number, because it can be changed into a prime (3859927) 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, 66523 + ... + 66580.

It is an arithmetic number, because the mean of its divisors is an integer number (998280).

Almost surely, 2^3859987 is an apocalyptic number.

3859987 is a deficient number, since it is larger than the sum of its proper divisors (133133).

3859987 is a wasteful number, since it uses less digits than its factorization.

3859987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133132.

The product of its digits is 544320, while the sum is 49.

The square root of 3859987 is about 1964.6849620232. The cubic root of 3859987 is about 156.8659247249.

It can be divided in two parts, 38 and 59987, that added together give a square (60025 = 245²).

The spelling of 3859987 in words is "three million, eight hundred fifty-nine thousand, nine hundred eighty-seven".