165372405 has 16 divisors (see below), whose sum is σ = 288650304. Its totient is φ = 80180480.

The previous prime is 165372401. The next prime is 165372407. The reversal of 165372405 is 504273561.

It is not a de Polignac number, because 165372405 - 2² = 165372401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165372401) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 500964 + ... + 501293.

It is an arithmetic number, because the mean of its divisors is an integer number (18040644).

Almost surely, 2^165372405 is an apocalyptic number.

165372405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165372405 is a deficient number, since it is larger than the sum of its proper divisors (123277899).

165372405 is a wasteful number, since it uses less digits than its factorization.

165372405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002276.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 165372405 is about 12859.7202535669. The cubic root of 165372405 is about 548.8929854685.

The spelling of 165372405 in words is "one hundred sixty-five million, three hundred seventy-two thousand, four hundred five".