428540389 has 2 divisors, whose sum is σ = 428540390. Its totient is φ = 428540388.

The previous prime is 428540377. The next prime is 428540479. The reversal of 428540389 is 983045824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273737025 + 154803364 = 16545^2 + 12442^2 .

It is a cyclic number.

It is not a de Polignac number, because 428540389 - 2²⁵ = 394985957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428540339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214270194 + 214270195.

It is an arithmetic number, because the mean of its divisors is an integer number (214270195).

Almost surely, 2^428540389 is an apocalyptic number.

It is an amenable number.

428540389 is a deficient number, since it is larger than the sum of its proper divisors (1).

428540389 is an equidigital number, since it uses as much as digits as its factorization.

428540389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 428540389 is about 20701.2170898235. The cubic root of 428540389 is about 753.9292389744.

The spelling of 428540389 in words is "four hundred twenty-eight million, five hundred forty thousand, three hundred eighty-nine".