164220405 has 8 divisors (see below), whose sum is σ = 262752672. Its totient is φ = 87584208.

The previous prime is 164220379. The next prime is 164220449. The reversal of 164220405 is 504022461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164220405 - 2⁹ = 164219893 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5473999 + ... + 5474028.

It is an arithmetic number, because the mean of its divisors is an integer number (32844084).

Almost surely, 2^164220405 is an apocalyptic number.

164220405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164220405 is a deficient number, since it is larger than the sum of its proper divisors (98532267).

164220405 is a wasteful number, since it uses less digits than its factorization.

164220405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10948035.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 164220405 is about 12814.8509550443. The cubic root of 164220405 is about 547.6154674000.

Adding to 164220405 its reverse (504022461), we get a palindrome (668242866).

The spelling of 164220405 in words is "one hundred sixty-four million, two hundred twenty thousand, four hundred five".