421431239 has 2 divisors, whose sum is σ = 421431240. Its totient is φ = 421431238.

The previous prime is 421431223. The next prime is 421431253. The reversal of 421431239 is 932134124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421431239 - 2⁴ = 421431223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421431209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210715619 + 210715620.

It is an arithmetic number, because the mean of its divisors is an integer number (210715620).

Almost surely, 2^421431239 is an apocalyptic number.

421431239 is a deficient number, since it is larger than the sum of its proper divisors (1).

421431239 is an equidigital number, since it uses as much as digits as its factorization.

421431239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 421431239 is about 20528.7904904308. The cubic root of 421431239 is about 749.7369382607.

It can be divided in two parts, 4214 and 31239, that added together give a palindrome (35453).

The spelling of 421431239 in words is "four hundred twenty-one million, four hundred thirty-one thousand, two hundred thirty-nine".