421340039 has 2 divisors, whose sum is σ = 421340040. Its totient is φ = 421340038.

The previous prime is 421340021. The next prime is 421340047. The reversal of 421340039 is 930043124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421340039 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421340099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210670019 + 210670020.

It is an arithmetic number, because the mean of its divisors is an integer number (210670020).

Almost surely, 2^421340039 is an apocalyptic number.

421340039 is a deficient number, since it is larger than the sum of its proper divisors (1).

421340039 is an equidigital number, since it uses as much as digits as its factorization.

421340039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 421340039 is about 20526.5690995841. The cubic root of 421340039 is about 749.6828519825.

The spelling of 421340039 in words is "four hundred twenty-one million, three hundred forty thousand, thirty-nine".