181238442 has 128 divisors (see below), whose sum is σ = 471398400. Its totient is φ = 45100800.

The previous prime is 181238437. The next prime is 181238471. The reversal of 181238442 is 244832181.

181238442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1662684 + ... + 1662792.

It is an arithmetic number, because the mean of its divisors is an integer number (3682800).

Almost surely, 2^181238442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181238442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235699200).

181238442 is an abundant number, since it is smaller than the sum of its proper divisors (290159958).

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

181238442 is a wasteful number, since it uses less digits than its factorization.

181238442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252.

The product of its digits is 12288, while the sum is 33.

The square root of 181238442 is about 13462.4827576491. The cubic root of 181238442 is about 565.9135683592.

It can be divided in two parts, 18123 and 8442, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 181238442 in words is "one hundred eighty-one million, two hundred thirty-eight thousand, four hundred forty-two".