164395990 has 16 divisors (see below), whose sum is σ = 322814160. Its totient is φ = 59780320.

The previous prime is 164395963. The next prime is 164395991. The reversal of 164395990 is 99593461.

It is a self number, because there is not a number n which added to its sum of digits gives 164395990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164395991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747145 + ... + 747364.

It is an arithmetic number, because the mean of its divisors is an integer number (20175885).

Almost surely, 2^164395990 is an apocalyptic number.

164395990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164395990 is a deficient number, since it is larger than the sum of its proper divisors (158418170).

164395990 is a wasteful number, since it uses less digits than its factorization.

164395990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494527.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 164395990 is about 12821.6999652932. The cubic root of 164395990 is about 547.8105686383.

The spelling of 164395990 in words is "one hundred sixty-four million, three hundred ninety-five thousand, nine hundred ninety".