428484391 has 2 divisors, whose sum is σ = 428484392. Its totient is φ = 428484390.

The previous prime is 428484323. The next prime is 428484403. The reversal of 428484391 is 193484824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428484391 - 2⁹ = 428483879 is a prime.

It is a super-5 number, since 5×428484391⁵ (a number of 44 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428484311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214242195 + 214242196.

It is an arithmetic number, because the mean of its divisors is an integer number (214242196).

Almost surely, 2^428484391 is an apocalyptic number.

428484391 is a deficient number, since it is larger than the sum of its proper divisors (1).

428484391 is an equidigital number, since it uses as much as digits as its factorization.

428484391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 43.

The square root of 428484391 is about 20699.8645164648. The cubic root of 428484391 is about 753.8963985314.

The spelling of 428484391 in words is "four hundred twenty-eight million, four hundred eighty-four thousand, three hundred ninety-one".