181801944 has 48 divisors (see below), whose sum is σ = 521347320. Its totient is φ = 57035520.

The previous prime is 181801943. The next prime is 181801967. The reversal of 181801944 is 449108181.

181801944 is digitally balanced in base 2, 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 (36).

It is a junction number, because it is equal to n+sod(n) for n = 181801899 and 181801908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181801943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73042 + ... + 75489.

Almost surely, 2^181801944 is an apocalyptic number.

It is an amenable number.

181801944 is an abundant number, since it is smaller than the sum of its proper divisors (339545376).

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

181801944 is a wasteful number, since it uses less digits than its factorization.

181801944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148560 (or 148553 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 181801944 is about 13483.3951214077. The cubic root of 181801944 is about 566.4994696270.

The spelling of 181801944 in words is "one hundred eighty-one million, eight hundred one thousand, nine hundred forty-four".