165406 has 8 divisors (see below), whose sum is σ = 249984. Its totient is φ = 82080.

The previous prime is 165397. The next prime is 165437. The reversal of 165406 is 604561.

165406 = T₁₆₀ + T₁₆₁ + ... + T₁₇₁.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166 + ... + 598.

It is an arithmetic number, because the mean of its divisors is an integer number (31248).

2¹⁶⁵⁴⁰⁶ is an apocalyptic number.

165406 is a deficient number, since it is larger than the sum of its proper divisors (84578).

165406 is a wasteful number, since it uses less digits than its factorization.

165406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 165406 is about 406.7013646400. The cubic root of 165406 is about 54.8930151708.

Adding to 165406 its reverse (604561), we get a palindrome (769967).

The spelling of 165406 in words is "one hundred sixty-five thousand, four hundred six".