181791340 has 12 divisors (see below), whose sum is σ = 381761856. Its totient is φ = 72716528.

The previous prime is 181791329. The next prime is 181791377. The reversal of 181791340 is 43197181.

It is a junction number, because it is equal to n+sod(n) for n = 181791296 and 181791305.

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, 4544764 + ... + 4544803.

It is an arithmetic number, because the mean of its divisors is an integer number (31813488).

Almost surely, 2^181791340 is an apocalyptic number.

181791340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181791340 is an abundant number, since it is smaller than the sum of its proper divisors (199970516).

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

181791340 is a wasteful number, since it uses less digits than its factorization.

181791340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9089576 (or 9089574 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 181791340 is about 13483.0018912704. The cubic root of 181791340 is about 566.4884553019.

The spelling of 181791340 in words is "one hundred eighty-one million, seven hundred ninety-one thousand, three hundred forty".