181269940 has 48 divisors (see below), whose sum is σ = 392736960. Its totient is φ = 70237440.

The previous prime is 181269931. The next prime is 181269947. The reversal of 181269940 is 49962181.

It is a super-2 number, since 2×181269940² = 65717582295207200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181269893 and 181269902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181269947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111856 + ... + 113464.

It is an arithmetic number, because the mean of its divisors is an integer number (8182020).

Almost surely, 2^181269940 is an apocalyptic number.

181269940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181269940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196368480).

181269940 is an abundant number, since it is smaller than the sum of its proper divisors (211467020).

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

181269940 is a wasteful number, since it uses less digits than its factorization.

181269940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792 (or 1790 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 181269940 is about 13463.6525504783. The cubic root of 181269940 is about 565.9463504277.

The spelling of 181269940 in words is "one hundred eighty-one million, two hundred sixty-nine thousand, nine hundred forty".