18179440 has 40 divisors (see below), whose sum is σ = 42662448. Its totient is φ = 7203840.

The previous prime is 18179437. The next prime is 18179461. The reversal of 18179440 is 4497181.

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 = 18179396 and 18179405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8035 + ... + 10045.

Almost surely, 2^18179440 is an apocalyptic number.

18179440 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 18179440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21331224).

18179440 is an abundant number, since it is smaller than the sum of its proper divisors (24483008).

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

18179440 is a wasteful number, since it uses less digits than its factorization.

18179440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18179440 is about 4263.7354514557. The cubic root of 18179440 is about 262.9421241565.

The spelling of 18179440 in words is "eighteen million, one hundred seventy-nine thousand, four hundred forty".