39649 has 4 divisors (see below), whose sum is σ = 40960.
Its totient is φ = 38340.
The previous prime is 39631. The next prime is 39659. The reversal of 39649 is 94693.
39649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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 39649 - 27 = 39521 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1279 = 39649 / (3 + 9 + 6 + 4 + 9).
It is a Duffinian number.
39649 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 39649.
It is not an unprimeable number, because it can be changed into a prime (39619) 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, 609 + ... + 670.
It is an arithmetic number, because the mean of its divisors is an integer number (10240).
239649 is an apocalyptic number.
It is an amenable number.
39649 is a deficient number, since it is larger than the sum of its proper divisors (1311).
39649 is a wasteful number, since it uses less digits than its factorization.
39649 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1310.
The product of its digits is 5832, while the sum is 31.
The square root of 39649 is about 199.1205664918.
The cubic root of 39649 is about 34.0991913076.
The spelling of 39649 in words is "thirty-nine thousand, six hundred forty-nine".