164638386 has 32 divisors (see below), whose sum is σ = 399124800. Its totient is φ = 49890240.

The previous prime is 164638381. The next prime is 164638399. The reversal of 164638386 is 683836461.

164638386 is a `hidden beast` number, since 1 + 6 + 4 + 638 + 3 + 8 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (164638381) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 137991 + ... + 139178.

It is an arithmetic number, because the mean of its divisors is an integer number (12472650).

Almost surely, 2^164638386 is an apocalyptic number.

164638386 is an abundant number, since it is smaller than the sum of its proper divisors (234486414).

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

164638386 is a wasteful number, since it uses less digits than its factorization.

164638386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277191 (or 277185 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 164638386 is about 12831.1490522088. The cubic root of 164638386 is about 548.0796787724.

The spelling of 164638386 in words is "one hundred sixty-four million, six hundred thirty-eight thousand, three hundred eighty-six".