181945364 has 12 divisors (see below), whose sum is σ = 332248224. Its totient is φ = 87017304.

The previous prime is 181945229. The next prime is 181945397. The reversal of 181945364 is 463549181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988742 + ... + 988925.

It is an arithmetic number, because the mean of its divisors is an integer number (27687352).

Almost surely, 2^181945364 is an apocalyptic number.

It is an amenable number.

181945364 is a deficient number, since it is larger than the sum of its proper divisors (150302860).

181945364 is a wasteful number, since it uses less digits than its factorization.

181945364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977694 (or 1977692 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 181945364 is about 13488.7124663550. The cubic root of 181945364 is about 566.6483972580.

The spelling of 181945364 in words is "one hundred eighty-one million, nine hundred forty-five thousand, three hundred sixty-four".