181572140 has 12 divisors (see below), whose sum is σ = 381301536. Its totient is φ = 72628848.

The previous prime is 181572137. The next prime is 181572169. The reversal of 181572140 is 41275181.

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, 4539284 + ... + 4539323.

It is an arithmetic number, because the mean of its divisors is an integer number (31775128).

Almost surely, 2^181572140 is an apocalyptic number.

181572140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181572140 is an abundant number, since it is smaller than the sum of its proper divisors (199729396).

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

181572140 is a wasteful number, since it uses less digits than its factorization.

181572140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9078616 (or 9078614 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 181572140 is about 13474.8706858359. The cubic root of 181572140 is about 566.2606772868.

The spelling of 181572140 in words is "one hundred eighty-one million, five hundred seventy-two thousand, one hundred forty".