165402 has 20 divisors (see below), whose sum is σ = 370986. Its totient is φ = 55080.

The previous prime is 165397. The next prime is 165437. The reversal of 165402 is 204561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 136161 + 29241 = 369^2 + 171^2 .

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

165402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 349 + ... + 672.

2¹⁶⁵⁴⁰² is an apocalyptic number.

165402 is an abundant number, since it is smaller than the sum of its proper divisors (205584).

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

165402 is a wasteful number, since it uses less digits than its factorization.

165402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 165402 is about 406.6964469970. The cubic root of 165402 is about 54.8925726761.

Adding to 165402 its reverse (204561), we get a palindrome (369963).

The spelling of 165402 in words is "one hundred sixty-five thousand, four hundred two".