4166639 has 4 divisors (see below), whose sum is σ = 4237320. Its totient is φ = 4095960.

The previous prime is 4166629. The next prime is 4166641. The reversal of 4166639 is 9366614.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4166639 - 2¹⁶ = 4101103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4166599 and 4166608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4166629) 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, 35252 + ... + 35369.

It is an arithmetic number, because the mean of its divisors is an integer number (1059330).

Almost surely, 2^4166639 is an apocalyptic number.

4166639 is a deficient number, since it is larger than the sum of its proper divisors (70681).

4166639 is an equidigital number, since it uses as much as digits as its factorization.

4166639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70680.

The product of its digits is 23328, while the sum is 35.

The square root of 4166639 is about 2041.2346753864. The cubic root of 4166639 is about 160.9145412752.

The spelling of 4166639 in words is "four million, one hundred sixty-six thousand, six hundred thirty-nine".