181722040 has 16 divisors (see below), whose sum is σ = 408874680. Its totient is φ = 72688800.

The previous prime is 181722029. The next prime is 181722043. The reversal of 181722040 is 40227181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 181721996 and 181722014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181722043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2271486 + ... + 2271565.

Almost surely, 2^181722040 is an apocalyptic number.

181722040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181722040 is an abundant number, since it is smaller than the sum of its proper divisors (227152640).

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

181722040 is a wasteful number, since it uses less digits than its factorization.

181722040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543062 (or 4543058 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 181722040 is about 13480.4317438278. The cubic root of 181722040 is about 566.4164631680.

The spelling of 181722040 in words is "one hundred eighty-one million, seven hundred twenty-two thousand, forty".