16423557 has 4 divisors (see below), whose sum is σ = 21898080. Its totient is φ = 10949036.

The previous prime is 16423553. The next prime is 16423559. The reversal of 16423557 is 75532461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16423557 - 2² = 16423553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16423553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2737257 + ... + 2737262.

It is an arithmetic number, because the mean of its divisors is an integer number (5474520).

Almost surely, 2^16423557 is an apocalyptic number.

It is an amenable number.

16423557 is a deficient number, since it is larger than the sum of its proper divisors (5474523).

16423557 is an equidigital number, since it uses as much as digits as its factorization.

16423557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474522.

The product of its digits is 25200, while the sum is 33.

The square root of 16423557 is about 4052.5987958346. The cubic root of 16423557 is about 254.1884077553.

The spelling of 16423557 in words is "sixteen million, four hundred twenty-three thousand, five hundred fifty-seven".