181940312 has 8 divisors (see below), whose sum is σ = 341138100. Its totient is φ = 90970152.

The previous prime is 181940303. The next prime is 181940347. The reversal of 181940312 is 213049181.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 11371262 + ... + 11371277.

Almost surely, 2^181940312 is an apocalyptic number.

It is an amenable number.

181940312 is a deficient number, since it is larger than the sum of its proper divisors (159197788).

181940312 is a wasteful number, since it uses less digits than its factorization.

181940312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22742545 (or 22742541 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 181940312 is about 13488.5251973668. The cubic root of 181940312 is about 566.6431525806.

Adding to 181940312 its reverse (213049181), we get a palindrome (394989493).

The spelling of 181940312 in words is "one hundred eighty-one million, nine hundred forty thousand, three hundred twelve".