39001021 has 4 divisors (see below), whose sum is σ = 39640444. Its totient is φ = 38361600.

The previous prime is 39001003. The next prime is 39001033. The reversal of 39001021 is 12010093.

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 3132900 + 35868121 = 1770^2 + 5989^2 .

It is a cyclic number.

It is not a de Polignac number, because 39001021 - 2⁹ = 39000509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39000986 and 39001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39001051) 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, 319620 + ... + 319741.

It is an arithmetic number, because the mean of its divisors is an integer number (9910111).

Almost surely, 2^39001021 is an apocalyptic number.

It is an amenable number.

39001021 is a deficient number, since it is larger than the sum of its proper divisors (639423).

39001021 is an equidigital number, since it uses as much as digits as its factorization.

39001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639422.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 39001021 is about 6245.0797432859. The cubic root of 39001021 is about 339.1241036148.

The spelling of 39001021 in words is "thirty-nine million, one thousand, twenty-one".