3857439 has 4 divisors (see below), whose sum is σ = 5143256. Its totient is φ = 2571624.

The previous prime is 3857429. The next prime is 3857443. The reversal of 3857439 is 9347583.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3857439 - 2⁷ = 3857311 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3857397 and 3857406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857429) 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, 642904 + ... + 642909.

It is an arithmetic number, because the mean of its divisors is an integer number (1285814).

Almost surely, 2^3857439 is an apocalyptic number.

3857439 is a deficient number, since it is larger than the sum of its proper divisors (1285817).

3857439 is a wasteful number, since it uses less digits than its factorization.

3857439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285816.

The product of its digits is 90720, while the sum is 39.

The square root of 3857439 is about 1964.0364049579. The cubic root of 3857439 is about 156.8314010891.

The spelling of 3857439 in words is "three million, eight hundred fifty-seven thousand, four hundred thirty-nine".