426638189 has 2 divisors, whose sum is σ = 426638190. Its totient is φ = 426638188.

The previous prime is 426638161. The next prime is 426638243. The reversal of 426638189 is 981836624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220284964 + 206353225 = 14842^2 + 14365^2 .

It is a cyclic number.

It is not a de Polignac number, because 426638189 - 2¹² = 426634093 is a prime.

It is equal to p_22678985 and since 426638189 and 22678985 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426638159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213319094 + 213319095.

It is an arithmetic number, because the mean of its divisors is an integer number (213319095).

Almost surely, 2^426638189 is an apocalyptic number.

It is an amenable number.

426638189 is a deficient number, since it is larger than the sum of its proper divisors (1).

426638189 is an equidigital number, since it uses as much as digits as its factorization.

426638189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 426638189 is about 20655.2218337156. The cubic root of 426638189 is about 752.8120736632.

The spelling of 426638189 in words is "four hundred twenty-six million, six hundred thirty-eight thousand, one hundred eighty-nine".