3681381 has 16 divisors (see below), whose sum is σ = 5387328. Its totient is φ = 2217600.

The previous prime is 3681373. The next prime is 3681407. The reversal of 3681381 is 1831863.

It is not a de Polignac number, because 3681381 - 2³ = 3681373 is a prime.

It is a super-2 number, since 2×3681381² = 27105132134322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9075 + ... + 9471.

It is an arithmetic number, because the mean of its divisors is an integer number (336708).

Almost surely, 2^3681381 is an apocalyptic number.

It is an amenable number.

3681381 is a deficient number, since it is larger than the sum of its proper divisors (1705947).

3681381 is a wasteful number, since it uses less digits than its factorization.

3681381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692.

The product of its digits is 3456, while the sum is 30.

The square root of 3681381 is about 1918.6925235691. The cubic root of 3681381 is about 154.4081627630.

The spelling of 3681381 in words is "three million, six hundred eighty-one thousand, three hundred eighty-one".