164808421 has 8 divisors (see below), whose sum is σ = 180520920. Its totient is φ = 149764608.

The previous prime is 164808419. The next prime is 164808433. The reversal of 164808421 is 124808461.

It can be written as a sum of positive squares in 4 ways, for example, as 50211396 + 114597025 = 7086^2 + 10705^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 164808421 - 2¹ = 164808419 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 (164808401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166656 + ... + 167641.

It is an arithmetic number, because the mean of its divisors is an integer number (22565115).

Almost surely, 2^164808421 is an apocalyptic number.

It is an amenable number.

164808421 is a deficient number, since it is larger than the sum of its proper divisors (15712499).

164808421 is a wasteful number, since it uses less digits than its factorization.

164808421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334343.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 164808421 is about 12837.7732103352. The cubic root of 164808421 is about 548.2682955067.

The spelling of 164808421 in words is "one hundred sixty-four million, eight hundred eight thousand, four hundred twenty-one".