164398638 has 16 divisors (see below), whose sum is σ = 329011200. Its totient is φ = 54763896.

The previous prime is 164398601. The next prime is 164398649. The reversal of 164398638 is 836893461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2131 + ... + 18257.

It is an arithmetic number, because the mean of its divisors is an integer number (20563200).

Almost surely, 2^164398638 is an apocalyptic number.

164398638 is an abundant number, since it is smaller than the sum of its proper divisors (164612562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164398638 is a wasteful number, since it uses less digits than its factorization.

164398638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17831.

The product of its digits is 746496, while the sum is 48.

The square root of 164398638 is about 12821.8032273156. The cubic root of 164398638 is about 547.8135098995.

The spelling of 164398638 in words is "one hundred sixty-four million, three hundred ninety-eight thousand, six hundred thirty-eight".