164140238 has 4 divisors (see below), whose sum is σ = 246210360. Its totient is φ = 82070118.

The previous prime is 164140217. The next prime is 164140267. The reversal of 164140238 is 832041461.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 164140238.

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 as a sum of consecutive naturals, namely, 41035058 + ... + 41035061.

It is an arithmetic number, because the mean of its divisors is an integer number (61552590).

Almost surely, 2^164140238 is an apocalyptic number.

164140238 is a deficient number, since it is larger than the sum of its proper divisors (82070122).

164140238 is an equidigital number, since it uses as much as digits as its factorization.

164140238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82070121.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 164140238 is about 12811.7226788594. The cubic root of 164140238 is about 547.5263436099.

Adding to 164140238 its reverse (832041461), we get a palindrome (996181699).

The spelling of 164140238 in words is "one hundred sixty-four million, one hundred forty thousand, two hundred thirty-eight".