181139740 has 24 divisors (see below), whose sum is σ = 384319152. Its totient is φ = 71708160.

The previous prime is 181139737. The next prime is 181139807. The reversal of 181139740 is 47931181.

It is a junction number, because it is equal to n+sod(n) for n = 181139696 and 181139705.

It is a congruent number.

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, 44746 + ... + 48625.

It is an arithmetic number, because the mean of its divisors is an integer number (16013298).

Almost surely, 2^181139740 is an apocalyptic number.

181139740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181139740 is an abundant number, since it is smaller than the sum of its proper divisors (203179412).

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

181139740 is a wasteful number, since it uses less digits than its factorization.

181139740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93477 (or 93475 counting only the distinct ones).

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

The square root of 181139740 is about 13458.8164412774. The cubic root of 181139740 is about 565.8108180021.

The spelling of 181139740 in words is "one hundred eighty-one million, one hundred thirty-nine thousand, seven hundred forty".