420742139 has 2 divisors, whose sum is σ = 420742140. Its totient is φ = 420742138.

The previous prime is 420742109. The next prime is 420742169. The reversal of 420742139 is 931247024.

It is a balanced prime because it is at equal distance from previous prime (420742109) and next prime (420742169).

It is a cyclic number.

It is not a de Polignac number, because 420742139 - 2⁸ = 420741883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420742109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210371069 + 210371070.

It is an arithmetic number, because the mean of its divisors is an integer number (210371070).

Almost surely, 2^420742139 is an apocalyptic number.

420742139 is a deficient number, since it is larger than the sum of its proper divisors (1).

420742139 is an equidigital number, since it uses as much as digits as its factorization.

420742139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 420742139 is about 20511.9998781201. Note that the first 3 decimals coincide. The cubic root of 420742139 is about 749.3280731618.

The spelling of 420742139 in words is "four hundred twenty million, seven hundred forty-two thousand, one hundred thirty-nine".