164243405 has 8 divisors (see below), whose sum is σ = 197192184. Its totient is φ = 131328000.

The previous prime is 164243399. The next prime is 164243411. The reversal of 164243405 is 504342461.

It is an interprime number because it is at equal distance from previous prime (164243399) and next prime (164243411).

It can be written as a sum of positive squares in 4 ways, for example, as 77492809 + 86750596 = 8803^2 + 9314^2 .

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

It is not a de Polignac number, because 164243405 - 2¹⁰ = 164242381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4205 + ... + 18605.

It is an arithmetic number, because the mean of its divisors is an integer number (24649023).

Almost surely, 2^164243405 is an apocalyptic number.

It is an amenable number.

164243405 is a deficient number, since it is larger than the sum of its proper divisors (32948779).

164243405 is a wasteful number, since it uses less digits than its factorization.

164243405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16687.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 164243405 is about 12815.7483199382. The cubic root of 164243405 is about 547.6410317582.

Adding to 164243405 its reverse (504342461), we get a palindrome (668585866).

The spelling of 164243405 in words is "one hundred sixty-four million, two hundred forty-three thousand, four hundred five".