3666381 has 8 divisors (see below), whose sum is σ = 4980960. Its totient is φ = 2398032.

The previous prime is 3666371. The next prime is 3666409. The reversal of 3666381 is 1836663.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3666381 - 2⁶ = 3666317 is a prime.

It is a super-2 number, since 2×3666381² = 26884699274322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11371 + ... + 11688.

It is an arithmetic number, because the mean of its divisors is an integer number (622620).

Almost surely, 2^3666381 is an apocalyptic number.

It is an amenable number.

3666381 is a deficient number, since it is larger than the sum of its proper divisors (1314579).

3666381 is a wasteful number, since it uses less digits than its factorization.

3666381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23115.

The product of its digits is 15552, while the sum is 33.

The square root of 3666381 is about 1914.7796217842. The cubic root of 3666381 is about 154.1981622852.

The spelling of 3666381 in words is "three million, six hundred sixty-six thousand, three hundred eighty-one".