165401236 has 96 divisors (see below), whose sum is σ = 393442560. Its totient is φ = 58752000.

The previous prime is 165401233. The next prime is 165401267. The reversal of 165401236 is 632104561.

165401236 is nontrivially palindromic in base 3.

165401236 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165401233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404200 + ... + 404608.

It is an arithmetic number, because the mean of its divisors is an integer number (4098360).

Almost surely, 2^165401236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165401236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196721280).

165401236 is an abundant number, since it is smaller than the sum of its proper divisors (228041324).

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

165401236 is a wasteful number, since it uses less digits than its factorization.

165401236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 543 counting only the distinct ones).

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

The square root of 165401236 is about 12860.8411855524. The cubic root of 165401236 is about 548.9248815883.

Adding to 165401236 its reverse (632104561), we get a palindrome (797505797).

The spelling of 165401236 in words is "one hundred sixty-five million, four hundred one thousand, two hundred thirty-six".