420142309 has 2 divisors, whose sum is σ = 420142310. Its totient is φ = 420142308.

The previous prime is 420142291. The next prime is 420142409. The reversal of 420142309 is 903241024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382319809 + 37822500 = 19553^2 + 6150^2 .

It is a cyclic number.

It is not a de Polignac number, because 420142309 - 2⁷ = 420142181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420142109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210071154 + 210071155.

It is an arithmetic number, because the mean of its divisors is an integer number (210071155).

Almost surely, 2^420142309 is an apocalyptic number.

It is an amenable number.

420142309 is a deficient number, since it is larger than the sum of its proper divisors (1).

420142309 is an equidigital number, since it uses as much as digits as its factorization.

420142309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 420142309 is about 20497.3732219521. The cubic root of 420142309 is about 748.9718112294.

The spelling of 420142309 in words is "four hundred twenty million, one hundred forty-two thousand, three hundred nine".