165213406 has 8 divisors (see below), whose sum is σ = 256365720. Its totient is φ = 79758168.

The previous prime is 165213397. The next prime is 165213421. The reversal of 165213406 is 604312561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1424196 + ... + 1424311.

It is an arithmetic number, because the mean of its divisors is an integer number (32045715).

Almost surely, 2^165213406 is an apocalyptic number.

165213406 is a deficient number, since it is larger than the sum of its proper divisors (91152314).

165213406 is a wasteful number, since it uses less digits than its factorization.

165213406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848538.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 165213406 is about 12853.5367117381. The cubic root of 165213406 is about 548.7170161248.

Adding to 165213406 its reverse (604312561), we get a palindrome (769525967).

The spelling of 165213406 in words is "one hundred sixty-five million, two hundred thirteen thousand, four hundred six".