39664249 has 4 divisors (see below), whose sum is σ = 39690340. Its totient is φ = 39638160.

The previous prime is 39664237. The next prime is 39664253. The reversal of 39664249 is 94246693.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17640000 + 22024249 = 4200^2 + 4693^2 .

It is a cyclic number.

It is not a de Polignac number, because 39664249 - 2¹¹ = 39662201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39664279) 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, 10614 + ... + 13855.

It is an arithmetic number, because the mean of its divisors is an integer number (9922585).

Almost surely, 2^39664249 is an apocalyptic number.

It is an amenable number.

39664249 is a deficient number, since it is larger than the sum of its proper divisors (26091).

39664249 is a wasteful number, since it uses less digits than its factorization.

39664249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26090.

The product of its digits is 279936, while the sum is 43.

The square root of 39664249 is about 6297.9559382390. The cubic root of 39664249 is about 341.0356226205.

The spelling of 39664249 in words is "thirty-nine million, six hundred sixty-four thousand, two hundred forty-nine".