423423157 has 2 divisors, whose sum is σ = 423423158. Its totient is φ = 423423156.

The previous prime is 423423109. The next prime is 423423239. The reversal of 423423157 is 751324324.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416527281 + 6895876 = 20409^2 + 2626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423423157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423423457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211711578 + 211711579.

It is an arithmetic number, because the mean of its divisors is an integer number (211711579).

Almost surely, 2^423423157 is an apocalyptic number.

It is an amenable number.

423423157 is a deficient number, since it is larger than the sum of its proper divisors (1).

423423157 is an equidigital number, since it uses as much as digits as its factorization.

423423157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 31.

The square root of 423423157 is about 20577.2485284112. The cubic root of 423423157 is about 750.9163064245.

The spelling of 423423157 in words is "four hundred twenty-three million, four hundred twenty-three thousand, one hundred fifty-seven".