3669861 has 8 divisors (see below), whose sum is σ = 5269600. Its totient is φ = 2258352.

The previous prime is 3669851. The next prime is 3669881. The reversal of 3669861 is 1689663.

It is a happy number.

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

It is not a de Polignac number, because 3669861 - 2⁵ = 3669829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 94099 = 3669861 / (3 + 6 + 6 + 9 + 8 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3669851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47011 + ... + 47088.

It is an arithmetic number, because the mean of its divisors is an integer number (658700).

Almost surely, 2^3669861 is an apocalyptic number.

It is an amenable number.

3669861 is a deficient number, since it is larger than the sum of its proper divisors (1599739).

3669861 is a wasteful number, since it uses less digits than its factorization.

3669861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94115.

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

The square root of 3669861 is about 1915.6881270186. The cubic root of 3669861 is about 154.2469333501.

The spelling of 3669861 in words is "three million, six hundred sixty-nine thousand, eight hundred sixty-one".