420431239 has 2 divisors, whose sum is σ = 420431240. Its totient is φ = 420431238.

The previous prime is 420431201. The next prime is 420431251. The reversal of 420431239 is 932134024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420431239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420431939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210215619 + 210215620.

It is an arithmetic number, because the mean of its divisors is an integer number (210215620).

Almost surely, 2^420431239 is an apocalyptic number.

420431239 is a deficient number, since it is larger than the sum of its proper divisors (1).

420431239 is an equidigital number, since it uses as much as digits as its factorization.

420431239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 420431239 is about 20504.4199869199. The cubic root of 420431239 is about 749.1434600841.

The spelling of 420431239 in words is "four hundred twenty million, four hundred thirty-one thousand, two hundred thirty-nine".