3667681 has 4 divisors (see below), whose sum is σ = 3684352. Its totient is φ = 3651012.

The previous prime is 3667679. The next prime is 3667721. The reversal of 3667681 is 1867663.

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 not a de Polignac number, because 3667681 - 2¹ = 3667679 is a prime.

It is a super-2 number, since 2×3667681² = 26903767835522, 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 3667681.

It is not an unprimeable number, because it can be changed into a prime (3667621) 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, 8001 + ... + 8446.

It is an arithmetic number, because the mean of its divisors is an integer number (921088).

Almost surely, 2^3667681 is an apocalyptic number.

It is an amenable number.

3667681 is a deficient number, since it is larger than the sum of its proper divisors (16671).

3667681 is a wasteful number, since it uses less digits than its factorization.

3667681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16670.

The product of its digits is 36288, while the sum is 37.

The square root of 3667681 is about 1915.1190563513. The cubic root of 3667681 is about 154.2163849707.

The spelling of 3667681 in words is "three million, six hundred sixty-seven thousand, six hundred eighty-one".