181404138 has 8 divisors (see below), whose sum is σ = 362808288. Its totient is φ = 60468044.

The previous prime is 181404109. The next prime is 181404163. The reversal of 181404138 is 831404181.

It is a sphenic number, since it is the product of 3 distinct primes.

181404138 is an admirable number.

It is a super-2 number, since 2×181404138² = 65814922567046088, which contains 22 as substring.

It is an unprimeable number.

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, 15117006 + ... + 15117017.

It is an arithmetic number, because the mean of its divisors is an integer number (45351036).

Almost surely, 2^181404138 is an apocalyptic number.

181404138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

181404138 is a wasteful number, since it uses less digits than its factorization.

181404138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30234028.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 181404138 is about 13468.6353428994. The cubic root of 181404138 is about 566.0859766923.

The spelling of 181404138 in words is "one hundred eighty-one million, four hundred four thousand, one hundred thirty-eight".