423557 has 2 divisors, whose sum is σ = 423558. Its totient is φ = 423556.

The previous prime is 423547. The next prime is 423559. The reversal of 423557 is 755324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417316 + 6241 = 646^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 423557 - 2⁴ = 423541 is a prime.

Together with 423559, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₃₅₆₆₆ and since 423557 and 35666 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 (423559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211778 + 211779.

It is an arithmetic number, because the mean of its divisors is an integer number (211779).

2⁴²³⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

423557 is a deficient number, since it is larger than the sum of its proper divisors (1).

423557 is an equidigital number, since it uses as much as digits as its factorization.

423557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 26.

The square root of 423557 is about 650.8125690243. The cubic root of 423557 is about 75.0995419011.

The spelling of 423557 in words is "four hundred twenty-three thousand, five hundred fifty-seven".