39648961 has 4 divisors (see below), whose sum is σ = 43253424. Its totient is φ = 36044500.

The previous prime is 39648901. The next prime is 39648971. The reversal of 39648961 is 16984693.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16984693 = 11 ⋅1544063.

It is a cyclic number.

It is not a de Polignac number, because 39648961 - 2¹¹ = 39646913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39648901) 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, 1802215 + ... + 1802236.

It is an arithmetic number, because the mean of its divisors is an integer number (10813356).

Almost surely, 2^39648961 is an apocalyptic number.

It is an amenable number.

39648961 is a deficient number, since it is larger than the sum of its proper divisors (3604463).

39648961 is a wasteful number, since it uses less digits than its factorization.

39648961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604462.

The product of its digits is 279936, while the sum is 46.

The square root of 39648961 is about 6296.7420941309. The cubic root of 39648961 is about 340.9918012723.

The spelling of 39648961 in words is "thirty-nine million, six hundred forty-eight thousand, nine hundred sixty-one".