405123172 has 6 divisors (see below), whose sum is σ = 708965558. Its totient is φ = 202561584.

The previous prime is 405123157. The next prime is 405123223. The reversal of 405123172 is 271321504.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 378847296 + 26275876 = 19464^2 + 5126^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50640393 + ... + 50640400.

Almost surely, 2^405123172 is an apocalyptic number.

It is an amenable number.

405123172 is a deficient number, since it is larger than the sum of its proper divisors (303842386).

405123172 is a wasteful number, since it uses less digits than its factorization.

405123172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101280797 (or 101280795 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 405123172 is about 20127.6717978012. The cubic root of 405123172 is about 739.9386192088.

Adding to 405123172 its reverse (271321504), we get a palindrome (676444676).

The spelling of 405123172 in words is "four hundred five million, one hundred twenty-three thousand, one hundred seventy-two".