3857021 has 4 divisors (see below), whose sum is σ = 4408032. Its totient is φ = 3306012.

The previous prime is 3857003. The next prime is 3857023. The reversal of 3857021 is 1207583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3857021 is a prime.

It is a super-2 number, since 2×3857021² = 29753221988882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857023) 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, 275495 + ... + 275508.

It is an arithmetic number, because the mean of its divisors is an integer number (1102008).

Almost surely, 2^3857021 is an apocalyptic number.

It is an amenable number.

3857021 is a deficient number, since it is larger than the sum of its proper divisors (551011).

3857021 is an equidigital number, since it uses as much as digits as its factorization.

3857021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551010.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 3857021 is about 1963.9299885688. The cubic root of 3857021 is about 156.8257360271.

The spelling of 3857021 in words is "three million, eight hundred fifty-seven thousand, twenty-one".