39648021 has 48 divisors (see below), whose sum is σ = 65404416. Its totient is φ = 20911968.

The previous prime is 39648019. The next prime is 39648043. The reversal of 39648021 is 12084693.

39648021 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 39648021 - 2¹ = 39648019 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39648001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 477646 + ... + 477728.

It is an arithmetic number, because the mean of its divisors is an integer number (1362592).

Almost surely, 2^39648021 is an apocalyptic number.

It is an amenable number.

39648021 is a deficient number, since it is larger than the sum of its proper divisors (25756395).

39648021 is a wasteful number, since it uses less digits than its factorization.

39648021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 39648021 is about 6296.6674519145. The cubic root of 39648021 is about 340.9891064995.

The spelling of 39648021 in words is "thirty-nine million, six hundred forty-eight thousand, twenty-one".