3666899 has 4 divisors (see below), whose sum is σ = 3671136. Its totient is φ = 3662664.

The previous prime is 3666881. The next prime is 3666907. The reversal of 3666899 is 9986663.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9986663 = 743 ⋅13441.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3666899 is a prime.

It is a super-2 number, since 2×3666899² = 26892296552402, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (3666809) 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, 299 + ... + 2724.

It is an arithmetic number, because the mean of its divisors is an integer number (917784).

Almost surely, 2^3666899 is an apocalyptic number.

3666899 is a deficient number, since it is larger than the sum of its proper divisors (4237).

3666899 is a wasteful number, since it uses less digits than its factorization.

3666899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236.

The product of its digits is 419904, while the sum is 47.

The square root of 3666899 is about 1914.9148806148. The cubic root of 3666899 is about 154.2054238406.

The spelling of 3666899 in words is "three million, six hundred sixty-six thousand, eight hundred ninety-nine".