3821381 has 4 divisors (see below), whose sum is σ = 3987552. Its totient is φ = 3655212.

The previous prime is 3821351. The next prime is 3821387. The reversal of 3821381 is 1831283.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1831283 = 23 ⋅79621.

It is a cyclic number.

It is not a de Polignac number, because 3821381 - 2⁶ = 3821317 is a prime.

It is a super-2 number, since 2×3821381² = 29205905494322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3821381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3821387) 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, 83051 + ... + 83096.

It is an arithmetic number, because the mean of its divisors is an integer number (996888).

Almost surely, 2^3821381 is an apocalyptic number.

It is an amenable number.

3821381 is a deficient number, since it is larger than the sum of its proper divisors (166171).

3821381 is a wasteful number, since it uses less digits than its factorization.

3821381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166170.

The product of its digits is 1152, while the sum is 26.

The square root of 3821381 is about 1954.8352871789. The cubic root of 3821381 is about 156.3412020090.

The spelling of 3821381 in words is "three million, eight hundred twenty-one thousand, three hundred eighty-one".