18368440 has 32 divisors (see below), whose sum is σ = 43506000. Its totient is φ = 6960384.

The previous prime is 18368437. The next prime is 18368447. The reversal of 18368440 is 4486381.

18368440 = T₁₃₈₁ + T₁₃₈₂ + ... + T₁₃₉₉.

It is a junction number, because it is equal to n+sod(n) for n = 18368396 and 18368405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368447) by changing a digit.

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, 11325 + ... + 12844.

Almost surely, 2^18368440 is an apocalyptic number.

18368440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18368440 is an abundant number, since it is smaller than the sum of its proper divisors (25137560).

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

18368440 is a wasteful number, since it uses less digits than its factorization.

18368440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24199 (or 24195 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 18368440 is about 4285.8418076266. The cubic root of 18368440 is about 263.8501981482.

The spelling of 18368440 in words is "eighteen million, three hundred sixty-eight thousand, four hundred forty".