164399903 has 4 divisors (see below), whose sum is σ = 164449800. Its totient is φ = 164350008.

The previous prime is 164399899. The next prime is 164399923. The reversal of 164399903 is 309993461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164399903 - 2² = 164399899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164399923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19628 + ... + 26721.

It is an arithmetic number, because the mean of its divisors is an integer number (41112450).

Almost surely, 2^164399903 is an apocalyptic number.

164399903 is a deficient number, since it is larger than the sum of its proper divisors (49897).

164399903 is an equidigital number, since it uses as much as digits as its factorization.

164399903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49896.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 164399903 is about 12821.8525572555. The cubic root of 164399903 is about 547.8149149847.

The spelling of 164399903 in words is "one hundred sixty-four million, three hundred ninety-nine thousand, nine hundred three".