181461380 has 24 divisors (see below), whose sum is σ = 383413632. Its totient is φ = 72137952.

The previous prime is 181461377. The next prime is 181461433. The reversal of 181461380 is 83164181.

It is a happy 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 in 7 ways as a sum of consecutive naturals, for example, 24572 + ... + 31091.

It is an arithmetic number, because the mean of its divisors is an integer number (15975568).

Almost surely, 2^181461380 is an apocalyptic number.

181461380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181461380 is an abundant number, since it is smaller than the sum of its proper divisors (201952252).

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

181461380 is a wasteful number, since it uses less digits than its factorization.

181461380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55835 (or 55833 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 181461380 is about 13470.7601864186. The cubic root of 181461380 is about 566.1455131617.

The spelling of 181461380 in words is "one hundred eighty-one million, four hundred sixty-one thousand, three hundred eighty".