181000740 has 24 divisors (see below), whose sum is σ = 506802240. Its totient is φ = 48266848.

The previous prime is 181000733. The next prime is 181000741. The reversal of 181000740 is 47000181.

It is a super-2 number, since 2×181000740² = 65522535761095200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181000741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1508280 + ... + 1508399.

It is an arithmetic number, because the mean of its divisors is an integer number (21116760).

Almost surely, 2^181000740 is an apocalyptic number.

181000740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181000740 is an abundant number, since it is smaller than the sum of its proper divisors (325801500).

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

181000740 is a wasteful number, since it uses less digits than its factorization.

181000740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016691 (or 3016689 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 181000740 is about 13453.6515489290. The cubic root of 181000740 is about 565.6660534695. Note that the first 3 decimals are identical.

The spelling of 181000740 in words is "one hundred eighty-one million, seven hundred forty", and thus it is an aban number.