420020039 has 2 divisors, whose sum is σ = 420020040. Its totient is φ = 420020038.

The previous prime is 420020009. The next prime is 420020057. The reversal of 420020039 is 930020024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420020039 - 2¹² = 420015943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420020039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420020009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210010019 + 210010020.

It is an arithmetic number, because the mean of its divisors is an integer number (210010020).

Almost surely, 2^420020039 is an apocalyptic number.

420020039 is a deficient number, since it is larger than the sum of its proper divisors (1).

420020039 is an equidigital number, since it uses as much as digits as its factorization.

420020039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 420020039 is about 20494.3904276268. The cubic root of 420020039 is about 748.8991488113.

The spelling of 420020039 in words is "four hundred twenty million, twenty thousand, thirty-nine".