420256237 has 2 divisors, whose sum is σ = 420256238. Its totient is φ = 420256236.

The previous prime is 420256183. The next prime is 420256241. The reversal of 420256237 is 732652024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233906436 + 186349801 = 15294^2 + 13651^2 .

It is a cyclic number.

It is not a de Polignac number, because 420256237 - 2¹¹ = 420254189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420256199 and 420256208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420256247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210128118 + 210128119.

It is an arithmetic number, because the mean of its divisors is an integer number (210128119).

Almost surely, 2^420256237 is an apocalyptic number.

It is an amenable number.

420256237 is a deficient number, since it is larger than the sum of its proper divisors (1).

420256237 is an equidigital number, since it uses as much as digits as its factorization.

420256237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 420256237 is about 20500.1521213868. The cubic root of 420256237 is about 749.0395034907.

The spelling of 420256237 in words is "four hundred twenty million, two hundred fifty-six thousand, two hundred thirty-seven".