428443243 has 2 divisors, whose sum is σ = 428443244. Its totient is φ = 428443242.

The previous prime is 428443207. The next prime is 428443259. The reversal of 428443243 is 342344824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428443243 - 2⁹ = 428442731 is a prime.

It is a super-2 number, since 2×428443243² = 367127224944714098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 428443199 and 428443208.

It is not a weakly prime, because it can be changed into another prime (428443273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214221621 + 214221622.

It is an arithmetic number, because the mean of its divisors is an integer number (214221622).

Almost surely, 2^428443243 is an apocalyptic number.

428443243 is a deficient number, since it is larger than the sum of its proper divisors (1).

428443243 is an equidigital number, since it uses as much as digits as its factorization.

428443243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 34.

The square root of 428443243 is about 20698.8705730530. The cubic root of 428443243 is about 753.8722651575.

The spelling of 428443243 in words is "four hundred twenty-eight million, four hundred forty-three thousand, two hundred forty-three".