164423903 has 4 divisors (see below), whose sum is σ = 187913040. Its totient is φ = 140934768.

The previous prime is 164423887. The next prime is 164423923. The reversal of 164423903 is 309324461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309324461 = 67 ⋅4616783.

It is a cyclic number.

It is not a de Polignac number, because 164423903 - 2⁴ = 164423887 is a prime.

It is a super-3 number, since 3×164423903³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 164423903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164423923) 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 in 3 ways as a sum of consecutive naturals, for example, 11744558 + ... + 11744571.

It is an arithmetic number, because the mean of its divisors is an integer number (46978260).

Almost surely, 2^164423903 is an apocalyptic number.

164423903 is a deficient number, since it is larger than the sum of its proper divisors (23489137).

164423903 is an equidigital number, since it uses as much as digits as its factorization.

164423903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23489136.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 164423903 is about 12822.7884252997. The cubic root of 164423903 is about 547.8415713634.

The spelling of 164423903 in words is "one hundred sixty-four million, four hundred twenty-three thousand, nine hundred three".