165001405 has 8 divisors (see below), whose sum is σ = 209648952. Its totient is φ = 124236288.

The previous prime is 165001391. The next prime is 165001423. The reversal of 165001405 is 504100561.

It can be written as a sum of positive squares in 4 ways, for example, as 79512889 + 85488516 = 8917^2 + 9246^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165001405 - 2²⁷ = 30783677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 970512 + ... + 970681.

It is an arithmetic number, because the mean of its divisors is an integer number (26206119).

Almost surely, 2^165001405 is an apocalyptic number.

It is an amenable number.

165001405 is a deficient number, since it is larger than the sum of its proper divisors (44647547).

165001405 is a wasteful number, since it uses less digits than its factorization.

165001405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941215.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 165001405 is about 12845.2872680995. The cubic root of 165001405 is about 548.4822120375.

Adding to 165001405 its reverse (504100561), we get a palindrome (669101966).

The spelling of 165001405 in words is "one hundred sixty-five million, one thousand, four hundred five".