181428 has 24 divisors (see below), whose sum is σ = 456288. Its totient is φ = 55776.

The previous prime is 181421. The next prime is 181439. The reversal of 181428 is 824181.

181428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181428² = 65832238368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181398 and 181407.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181428.

It is not an unprimeable number, because it can be changed into a prime (181421) by changing a digit.

181428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426 + ... + 737.

It is an arithmetic number, because the mean of its divisors is an integer number (19012).

2¹⁸¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

181428 is an abundant number, since it is smaller than the sum of its proper divisors (274860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181428 is a wasteful number, since it uses less digits than its factorization.

181428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183 (or 1181 counting only the distinct ones).

The product of its digits is 512, while the sum is 24.

The square root of 181428 is about 425.9436582460. The cubic root of 181428 is about 56.6110796691.

The spelling of 181428 in words is "one hundred eighty-one thousand, four hundred twenty-eight".