3666399 has 8 divisors (see below), whose sum is σ = 5332992. Its totient is φ = 2222040.

The previous prime is 3666371. The next prime is 3666409. The reversal of 3666399 is 9936663.

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

It is not a de Polignac number, because 3666399 - 2¹¹ = 3664351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3666399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666599) 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, 55519 + ... + 55584.

It is an arithmetic number, because the mean of its divisors is an integer number (666624).

Almost surely, 2^3666399 is an apocalyptic number.

3666399 is a deficient number, since it is larger than the sum of its proper divisors (1666593).

3666399 is a wasteful number, since it uses less digits than its factorization.

3666399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111117.

The product of its digits is 157464, while the sum is 42.

The square root of 3666399 is about 1914.7843220582. The cubic root of 3666399 is about 154.1984146287.

The spelling of 3666399 in words is "three million, six hundred sixty-six thousand, three hundred ninety-nine".