3666667 has 4 divisors (see below), whose sum is σ = 3671920. Its totient is φ = 3661416.

The previous prime is 3666661. The next prime is 3666703. The reversal of 3666667 is 7666663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7666663 = 61 ⋅125683.

It is a cyclic number.

It is not a de Polignac number, because 3666667 - 2³ = 3666659 is a prime.

It is a super-4 number, since 4×3666667⁴ (a number of 27 digits) contains 4444 as substring.

It is a Duffinian number.

3666667 is a lucky number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (3666661) 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, 1383 + ... + 3040.

It is an arithmetic number, because the mean of its divisors is an integer number (917980).

Almost surely, 2^3666667 is an apocalyptic number.

3666667 is a deficient number, since it is larger than the sum of its proper divisors (5253).

3666667 is an equidigital number, since it uses as much as digits as its factorization.

3666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252.

The product of its digits is 163296, while the sum is 40.

The square root of 3666667 is about 1914.8543025515. The cubic root of 3666667 is about 154.2021716456.

The spelling of 3666667 in words is "three million, six hundred sixty-six thousand, six hundred sixty-seven".