3868639 has 4 divisors (see below), whose sum is σ = 4096224. Its totient is φ = 3641056.

The previous prime is 3868619. The next prime is 3868649. The reversal of 3868639 is 9368683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9368683 = 17 ⋅551099.

It is a cyclic number.

It is not a de Polignac number, because 3868639 - 2¹⁹ = 3344351 is a prime.

It is a d-powerful number, because it can be written as 3² + 8⁵ + 6² + 8⁷ + 6⁸ + 3¹⁰ + 9 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3868595 and 3868604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3868619) 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, 113767 + ... + 113800.

It is an arithmetic number, because the mean of its divisors is an integer number (1024056).

Almost surely, 2^3868639 is an apocalyptic number.

3868639 is a deficient number, since it is larger than the sum of its proper divisors (227585).

3868639 is a wasteful number, since it uses less digits than its factorization.

3868639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227584.

The product of its digits is 186624, while the sum is 43.

The square root of 3868639 is about 1966.8856092818. The cubic root of 3868639 is about 156.9830400764.

It can be divided in two parts, 386 and 8639, that added together give a square (9025 = 95²).

The spelling of 3868639 in words is "three million, eight hundred sixty-eight thousand, six hundred thirty-nine".