3857639 has 4 divisors (see below), whose sum is σ = 3869424. Its totient is φ = 3845856.

The previous prime is 3857621. The next prime is 3857641. The reversal of 3857639 is 9367583.

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 3857639 - 2⁸ = 3857383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3857596 and 3857605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857039) 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, 5387 + ... + 6060.

It is an arithmetic number, because the mean of its divisors is an integer number (967356).

Almost surely, 2^3857639 is an apocalyptic number.

3857639 is a deficient number, since it is larger than the sum of its proper divisors (11785).

3857639 is a wasteful number, since it uses less digits than its factorization.

3857639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11784.

The product of its digits is 136080, while the sum is 41.

The square root of 3857639 is about 1964.0873198511. The cubic root of 3857639 is about 156.8341115004.

The spelling of 3857639 in words is "three million, eight hundred fifty-seven thousand, six hundred thirty-nine".