428434891 has 2 divisors, whose sum is σ = 428434892. Its totient is φ = 428434890.

The previous prime is 428434847. The next prime is 428434943. The reversal of 428434891 is 198434824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428434891 - 2⁷ = 428434763 is a prime.

It is equal to p_22769386 and since 428434891 and 22769386 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (428434091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214217445 + 214217446.

It is an arithmetic number, because the mean of its divisors is an integer number (214217446).

Almost surely, 2^428434891 is an apocalyptic number.

428434891 is a deficient number, since it is larger than the sum of its proper divisors (1).

428434891 is an equidigital number, since it uses as much as digits as its factorization.

428434891 is an odious number, because the sum of its binary digits is odd.

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

The square root of 428434891 is about 20698.6688219315. The cubic root of 428434891 is about 753.8673665063.

The spelling of 428434891 in words is "four hundred twenty-eight million, four hundred thirty-four thousand, eight hundred ninety-one".