39443661 has 6 divisors (see below), whose sum is σ = 56974190. Its totient is φ = 26295768.

The previous prime is 39443659. The next prime is 39443671. The reversal of 39443661 is 16634493.

It can be written as a sum of positive squares in only one way, i.e., 35928036 + 3515625 = 5994^2 + 1875^2 .

It is not a de Polignac number, because 39443661 - 2¹ = 39443659 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 (39443671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2191306 + ... + 2191323.

Almost surely, 2^39443661 is an apocalyptic number.

It is an amenable number.

39443661 is a deficient number, since it is larger than the sum of its proper divisors (17530529).

39443661 is a wasteful number, since it uses less digits than its factorization.

39443661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382635 (or 4382632 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 39443661 is about 6280.4188554586. The cubic root of 39443661 is about 340.4022373246.

It can be divided in two parts, 39443 and 661, that added together give a palindrome (40104).

The spelling of 39443661 in words is "thirty-nine million, four hundred forty-three thousand, six hundred sixty-one".