164443986 has 32 divisors (see below), whose sum is σ = 417636480. Its totient is φ = 46983888.

The previous prime is 164443973. The next prime is 164444011. The reversal of 164443986 is 689344461.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217141 + ... + 217896.

It is an arithmetic number, because the mean of its divisors is an integer number (13051140).

Almost surely, 2^164443986 is an apocalyptic number.

164443986 is an abundant number, since it is smaller than the sum of its proper divisors (253192494).

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

164443986 is a wasteful number, since it uses less digits than its factorization.

164443986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435055 (or 435049 counting only the distinct ones).

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

The square root of 164443986 is about 12823.5714993913. The cubic root of 164443986 is about 547.8638752056.

The spelling of 164443986 in words is "one hundred sixty-four million, four hundred forty-three thousand, nine hundred eighty-six".