182221840 has 40 divisors (see below), whose sum is σ = 427573080. Its totient is φ = 72216576.

The previous prime is 182221811. The next prime is 182221841. The reversal of 182221840 is 48122281.

It can be written as a sum of positive squares in 4 ways, for example, as 37356544 + 144865296 = 6112^2 + 12036^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 182221799 and 182221808.

It is not an unprimeable number, because it can be changed into a prime (182221841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1729 + ... + 19168.

It is an arithmetic number, because the mean of its divisors is an integer number (10689327).

Almost surely, 2^182221840 is an apocalyptic number.

182221840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

182221840 is an abundant number, since it is smaller than the sum of its proper divisors (245351240).

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

182221840 is a wasteful number, since it uses less digits than its factorization.

182221840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21019 (or 21013 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 182221840 is about 13498.9569967461. The cubic root of 182221840 is about 566.9352698154.

The spelling of 182221840 in words is "one hundred eighty-two million, two hundred twenty-one thousand, eight hundred forty".