309172 has 12 divisors (see below), whose sum is σ = 555940. Its totient is φ = 150336.

The previous prime is 309167. The next prime is 309173. The reversal of 309172 is 271903.

309172 is nontrivially palindromic in base 16.

309172 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 2 ways, for example, as 274576 + 34596 = 524^2 + 186^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309173) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 897 + ... + 1192.

2³⁰⁹¹⁷² is an apocalyptic number.

It is an amenable number.

309172 is a deficient number, since it is larger than the sum of its proper divisors (246768).

309172 is a wasteful number, since it uses less digits than its factorization.

309172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130 (or 2128 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 309172 is about 556.0323731583. The cubic root of 309172 is about 67.6186846569.

The spelling of 309172 in words is "three hundred nine thousand, one hundred seventy-two".