181836740 has 24 divisors (see below), whose sum is σ = 382242840. Its totient is φ = 72661248.

The previous prime is 181836691. The next prime is 181836779. The reversal of 181836740 is 47638181.

It can be written as a sum of positive squares in 4 ways, for example, as 8809024 + 173027716 = 2968^2 + 13154^2 .

It is a super-4 number, since 4×181836740⁴ (a number of 34 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 181836694 and 181836703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18554 + ... + 26606.

It is an arithmetic number, because the mean of its divisors is an integer number (15926785).

Almost surely, 2^181836740 is an apocalyptic number.

181836740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181836740 is an abundant number, since it is smaller than the sum of its proper divisors (200406100).

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

181836740 is a wasteful number, since it uses less digits than its factorization.

181836740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9191 (or 9189 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 181836740 is about 13484.6853875053. The cubic root of 181836740 is about 566.5356090611.

The spelling of 181836740 in words is "one hundred eighty-one million, eight hundred thirty-six thousand, seven hundred forty".