3666799 has 4 divisors (see below), whose sum is σ = 3744864. Its totient is φ = 3588736.

The previous prime is 3666797. The next prime is 3666809. The reversal of 3666799 is 9976663.

3666799 = T₁₅₆₂ + T₁₅₆₃ + T₁₅₆₄.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9976663 = 1697 ⋅5879.

It is a cyclic number.

It is not a de Polignac number, because 3666799 - 2¹ = 3666797 is a prime.

It is a Duffinian number.

3666799 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666797) 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 3 ways as a sum of consecutive naturals, for example, 38962 + ... + 39055.

It is an arithmetic number, because the mean of its divisors is an integer number (936216).

Almost surely, 2^3666799 is an apocalyptic number.

3666799 is the 1564-th centered triangular number.

3666799 is a deficient number, since it is larger than the sum of its proper divisors (78065).

3666799 is an equidigital number, since it uses as much as digits as its factorization.

3666799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78064.

The product of its digits is 367416, while the sum is 46.

The square root of 3666799 is about 1914.8887696156. Note that the first 3 decimals coincide. The cubic root of 3666799 is about 154.2040220492.

It can be divided in two parts, 3666 and 799, that added together give a triangular number (4465 = T₉₄).

The spelling of 3666799 in words is "three million, six hundred sixty-six thousand, seven hundred ninety-nine".