165400 has 24 divisors (see below), whose sum is σ = 385020. Its totient is φ = 66080.

The previous prime is 165397. The next prime is 165437. The reversal of 165400 is 4561.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214 + ... + 613.

2¹⁶⁵⁴⁰⁰ is an apocalyptic number.

165400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165400 is an abundant number, since it is smaller than the sum of its proper divisors (219620).

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

165400 is a wasteful number, since it uses less digits than its factorization.

165400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 165400 is about 406.6939881533. The cubic root of 165400 is about 54.8923514261.

Adding to 165400 its reverse (4561), we get a palindrome (169961).

It can be divided in two parts, 165 and 400, that added together give a palindrome (565).

The spelling of 165400 in words is "one hundred sixty-five thousand, four hundred".