4239661 has 4 divisors (see below), whose sum is σ = 4279392. Its totient is φ = 4199932.

The previous prime is 4239649. The next prime is 4239667. The reversal of 4239661 is 1669324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4239661 - 2⁷ = 4239533 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4239667) 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, 19705 + ... + 19918.

It is an arithmetic number, because the mean of its divisors is an integer number (1069848).

Almost surely, 2^4239661 is an apocalyptic number.

It is an amenable number.

4239661 is a deficient number, since it is larger than the sum of its proper divisors (39731).

4239661 is a wasteful number, since it uses less digits than its factorization.

4239661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39730.

The product of its digits is 7776, while the sum is 31.

The square root of 4239661 is about 2059.0437100751. The cubic root of 4239661 is about 161.8491330293.

It can be divided in two parts, 4239 and 661, that added together give a square (4900 = 70²).

The spelling of 4239661 in words is "four million, two hundred thirty-nine thousand, six hundred sixty-one".