4139666 has 12 divisors (see below), whose sum is σ = 6351198. Its totient is φ = 2023632.

The previous prime is 4139659. The next prime is 4139677. The reversal of 4139666 is 6669314.

It can be written as a sum of positive squares in only one way, i.e., 4084441 + 55225 = 2021^2 + 235^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3950 + ... + 4886.

Almost surely, 2^4139666 is an apocalyptic number.

4139666 is a deficient number, since it is larger than the sum of its proper divisors (2211532).

4139666 is an equidigital number, since it uses as much as digits as its factorization.

4139666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 986 counting only the distinct ones).

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

The square root of 4139666 is about 2034.6169172599. The cubic root of 4139666 is about 160.5665591574.

It can be divided in two parts, 41 and 39666, that multiplied together give a triangular number (1626306 = T₁₈₀₃).

The spelling of 4139666 in words is "four million, one hundred thirty-nine thousand, six hundred sixty-six".