181904145 has 8 divisors (see below), whose sum is σ = 291046656. Its totient is φ = 97015536.

The previous prime is 181904141. The next prime is 181904159. The reversal of 181904145 is 541409181.

181904145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 181904145 - 2² = 181904141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181904141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6063457 + ... + 6063486.

It is an arithmetic number, because the mean of its divisors is an integer number (36380832).

Almost surely, 2^181904145 is an apocalyptic number.

181904145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181904145 is a deficient number, since it is larger than the sum of its proper divisors (109142511).

181904145 is a wasteful number, since it uses less digits than its factorization.

181904145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12126951.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 181904145 is about 13487.1844726763. The cubic root of 181904145 is about 566.6056033778.

The spelling of 181904145 in words is "one hundred eighty-one million, nine hundred four thousand, one hundred forty-five".