181207040 has 136 divisors (see below), whose sum is σ = 503312640. Its totient is φ = 61341696.

The previous prime is 181207021. The next prime is 181207067. The reversal of 181207040 is 40702181.

It is a junction number, because it is equal to n+sod(n) for n = 181206997 and 181207015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2293721 + ... + 2293799.

Almost surely, 2^181207040 is an apocalyptic number.

181207040 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 181207040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251656320).

181207040 is an abundant number, since it is smaller than the sum of its proper divisors (322105600).

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

181207040 is an frugal number, since it uses more digits than its factorization.

181207040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 181207040 is about 13461.3164289381. The cubic root of 181207040 is about 565.8808824233.

The spelling of 181207040 in words is "one hundred eighty-one million, two hundred seven thousand, forty".