164220138 has 24 divisors (see below), whose sum is σ = 371281248. Its totient is φ = 52359912.

The previous prime is 164220137. The next prime is 164220157. The reversal of 164220138 is 831022461.

164220138 is a `hidden beast` number, since 1 + 642 + 2 + 0 + 13 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (164220137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197920 + ... + 198747.

It is an arithmetic number, because the mean of its divisors is an integer number (15470052).

Almost surely, 2^164220138 is an apocalyptic number.

164220138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

164220138 is an abundant number, since it is smaller than the sum of its proper divisors (207061110).

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

164220138 is a wasteful number, since it uses less digits than its factorization.

164220138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396698 (or 396695 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 164220138 is about 12814.8405374394. The cubic root of 164220138 is about 547.6151706171.

Adding to 164220138 its reverse (831022461), we get a palindrome (995242599).

The spelling of 164220138 in words is "one hundred sixty-four million, two hundred twenty thousand, one hundred thirty-eight".