3666247 has 4 divisors (see below), whose sum is σ = 3948280. Its totient is φ = 3384216.

The previous prime is 3666241. The next prime is 3666251. The reversal of 3666247 is 7426663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7426663 = 19 ⋅390877.

It is a cyclic number.

It is not a de Polignac number, because 3666247 - 2⁷ = 3666119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666241) 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, 140997 + ... + 141022.

It is an arithmetic number, because the mean of its divisors is an integer number (987070).

Almost surely, 2^3666247 is an apocalyptic number.

3666247 is a deficient number, since it is larger than the sum of its proper divisors (282033).

3666247 is a wasteful number, since it uses less digits than its factorization.

3666247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282032.

The product of its digits is 36288, while the sum is 34.

The square root of 3666247 is about 1914.7446304925. The cubic root of 3666247 is about 154.1962837020.

The spelling of 3666247 in words is "three million, six hundred sixty-six thousand, two hundred forty-seven".