181193940 has 36 divisors (see below), whose sum is σ = 549622164. Its totient is φ = 48318336.

The previous prime is 181193933. The next prime is 181193941. The reversal of 181193940 is 49391181.

181193940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 61685316 + 119508624 = 7854^2 + 10932^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 181193895 and 181193904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181193941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 503137 + ... + 503496.

Almost surely, 2^181193940 is an apocalyptic number.

181193940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181193940 is an abundant number, since it is smaller than the sum of its proper divisors (368428224).

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

181193940 is a wasteful number, since it uses less digits than its factorization.

181193940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006648 (or 1006643 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 181193940 is about 13460.8298406896. The cubic root of 181193940 is about 565.8672456863.

The spelling of 181193940 in words is "one hundred eighty-one million, one hundred ninety-three thousand, nine hundred forty".