3862821 has 4 divisors (see below), whose sum is σ = 5150432. Its totient is φ = 2575212.

The previous prime is 3862811. The next prime is 3862841. The reversal of 3862821 is 1282683.

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 not a de Polignac number, because 3862821 - 2¹³ = 3854629 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3862811) 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, 643801 + ... + 643806.

It is an arithmetic number, because the mean of its divisors is an integer number (1287608).

Almost surely, 2^3862821 is an apocalyptic number.

It is an amenable number.

3862821 is a deficient number, since it is larger than the sum of its proper divisors (1287611).

3862821 is a wasteful number, since it uses less digits than its factorization.

3862821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287610.

The product of its digits is 4608, while the sum is 30.

The square root of 3862821 is about 1965.4060649138. The cubic root of 3862821 is about 156.9043056207.

The spelling of 3862821 in words is "three million, eight hundred sixty-two thousand, eight hundred twenty-one".