181199340 has 144 divisors (see below), whose sum is σ = 648560640. Its totient is φ = 40072320.

The previous prime is 181199321. The next prime is 181199363. The reversal of 181199340 is 43991181.

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 = 181199295 and 181199304.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36741 + ... + 41379.

Almost surely, 2^181199340 is an apocalyptic number.

181199340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181199340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324280320).

181199340 is an abundant number, since it is smaller than the sum of its proper divisors (467361300).

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

181199340 is a wasteful number, since it uses less digits than its factorization.

181199340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4692 (or 4687 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 181199340 is about 13461.0304211825. The cubic root of 181199340 is about 565.8728670163.

The spelling of 181199340 in words is "one hundred eighty-one million, one hundred ninety-nine thousand, three hundred forty".