3857239 has 4 divisors (see below), whose sum is σ = 3951360. Its totient is φ = 3763120.

The previous prime is 3857233. The next prime is 3857263. The reversal of 3857239 is 9327583.

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 3857239 - 2⁵ = 3857207 is a prime.

It is a d-powerful number, because it can be written as 3³ + 8² + 5⁸ + 7⁷ + 2²⁰ + 3¹³ + 9² .

It is a Duffinian number.

3857239 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3857198 and 3857207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857233) 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, 46999 + ... + 47080.

It is an arithmetic number, because the mean of its divisors is an integer number (987840).

Almost surely, 2^3857239 is an apocalyptic number.

3857239 is a deficient number, since it is larger than the sum of its proper divisors (94121).

3857239 is an equidigital number, since it uses as much as digits as its factorization.

3857239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94120.

The product of its digits is 45360, while the sum is 37.

The square root of 3857239 is about 1963.9854887448. The cubic root of 3857239 is about 156.8286905842.

It can be divided in two parts, 3857 and 239, that added together give a 12-th power (4096 = 2¹²).

The spelling of 3857239 in words is "three million, eight hundred fifty-seven thousand, two hundred thirty-nine".