405172 has 6 divisors (see below), whose sum is σ = 709058. Its totient is φ = 202584.

The previous prime is 405157. The next prime is 405179. The reversal of 405172 is 271504.

405172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 404496 + 676 = 636^2 + 26^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50643 + ... + 50650.

2⁴⁰⁵¹⁷² is an apocalyptic number.

It is an amenable number.

405172 is a deficient number, since it is larger than the sum of its proper divisors (303886).

405172 is a wasteful number, since it uses less digits than its factorization.

405172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101297 (or 101295 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 405172 is about 636.5312246858. The cubic root of 405172 is about 73.9968345371.

Adding to 405172 its reverse (271504), we get a palindrome (676676).

The spelling of 405172 in words is "four hundred five thousand, one hundred seventy-two".