39000021 has 8 divisors (see below), whose sum is σ = 52033344. Its totient is φ = 25983360.

The previous prime is 39000001. The next prime is 39000037. The reversal of 39000021 is 12000093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39000021 - 2⁹ = 38999509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39000001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3120 + ... + 9366.

It is an arithmetic number, because the mean of its divisors is an integer number (6504168).

Almost surely, 2^39000021 is an apocalyptic number.

It is an amenable number.

39000021 is a deficient number, since it is larger than the sum of its proper divisors (13033323).

39000021 is a wasteful number, since it uses less digits than its factorization.

39000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 39000021 is about 6244.9996797438. Note that the first 3 decimals coincide. The cubic root of 39000021 is about 339.1212051693.

The spelling of 39000021 in words is "thirty-nine million, twenty-one", and thus it is an aban number and an uban number.