180001945 has 4 divisors (see below), whose sum is σ = 216002340. Its totient is φ = 144001552.

The previous prime is 180001937. The next prime is 180001949. The reversal of 180001945 is 549100081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53056656 + 126945289 = 7284^2 + 11267^2 .

It is a cyclic number.

It is not a de Polignac number, because 180001945 - 2³ = 180001937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180001949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18000190 + ... + 18000199.

It is an arithmetic number, because the mean of its divisors is an integer number (54000585).

Almost surely, 2^180001945 is an apocalyptic number.

It is an amenable number.

180001945 is a deficient number, since it is larger than the sum of its proper divisors (36000395).

180001945 is an equidigital number, since it uses as much as digits as its factorization.

180001945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36000394.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 180001945 is about 13416.4803506732. The cubic root of 180001945 is about 564.6236510047.

The spelling of 180001945 in words is "one hundred eighty million, one thousand, nine hundred forty-five".