3987239 has 4 divisors (see below), whose sum is σ = 4124760. Its totient is φ = 3849720.

The previous prime is 3987229. The next prime is 3987259. The reversal of 3987239 is 9327893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9327893 = 109 ⋅85577.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3987239 is a prime.

It is a d-powerful number, because it can be written as 3¹¹ + 9⁵ + 8³ + 7 + 2²¹ + 3¹³ + 9⁵ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3987196 and 3987205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987229) 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, 68717 + ... + 68774.

It is an arithmetic number, because the mean of its divisors is an integer number (1031190).

Almost surely, 2^3987239 is an apocalyptic number.

3987239 is a deficient number, since it is larger than the sum of its proper divisors (137521).

3987239 is a wasteful number, since it uses less digits than its factorization.

3987239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137520.

The product of its digits is 81648, while the sum is 41.

The square root of 3987239 is about 1996.8072015094. The cubic root of 3987239 is about 158.5711184924.

It can be divided in two parts, 39 and 87239, that added together give a palindrome (87278).

The spelling of 3987239 in words is "three million, nine hundred eighty-seven thousand, two hundred thirty-nine".