164638942 has 16 divisors (see below), whose sum is σ = 266505120. Its totient is φ = 75830112.

The previous prime is 164638913. The next prime is 164638949. The reversal of 164638942 is 249836461.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164638949) 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 7 ways as a sum of consecutive naturals, for example, 6784 + ... + 19372.

It is an arithmetic number, because the mean of its divisors is an integer number (16656570).

Almost surely, 2^164638942 is an apocalyptic number.

164638942 is a deficient number, since it is larger than the sum of its proper divisors (101866178).

164638942 is a wasteful number, since it uses less digits than its factorization.

164638942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13107.

The product of its digits is 248832, while the sum is 43.

The square root of 164638942 is about 12831.1707182159. The cubic root of 164638942 is about 548.0802957447.

The spelling of 164638942 in words is "one hundred sixty-four million, six hundred thirty-eight thousand, nine hundred forty-two".