3689661 has 8 divisors (see below), whose sum is σ = 4928544. Its totient is φ = 2455280.

The previous prime is 3689633. The next prime is 3689669. The reversal of 3689661 is 1669863.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 3689661 - 2⁶ = 3689597 is a prime.

It is a super-2 number, since 2×3689661² = 27227196589842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3689669) 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, 2170 + ... + 3476.

It is an arithmetic number, because the mean of its divisors is an integer number (616068).

Almost surely, 2^3689661 is an apocalyptic number.

It is an amenable number.

3689661 is a deficient number, since it is larger than the sum of its proper divisors (1238883).

3689661 is a wasteful number, since it uses less digits than its factorization.

3689661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251.

The product of its digits is 46656, while the sum is 39.

The square root of 3689661 is about 1920.8490310277. The cubic root of 3689661 is about 154.5238387614.

The spelling of 3689661 in words is "three million, six hundred eighty-nine thousand, six hundred sixty-one".