18496640 has 32 divisors (see below), whose sum is σ = 44220060. Its totient is φ = 7398400.

The previous prime is 18496619. The next prime is 18496649. The reversal of 18496640 is 4669481.

It can be written as a sum of positive squares in 2 ways, for example, as 16711744 + 1784896 = 4088^2 + 1336^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 18496594 and 18496603.

It is not an unprimeable number, because it can be changed into a prime (18496649) 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, 13811 + ... + 15090.

Almost surely, 2^18496640 is an apocalyptic number.

18496640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18496640 is an abundant number, since it is smaller than the sum of its proper divisors (25723420).

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

18496640 is an equidigital number, since it uses as much as digits as its factorization.

18496640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28920 (or 28908 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 18496640 is about 4300.7720237185. The cubic root of 18496640 is about 264.4626109864.

The spelling of 18496640 in words is "eighteen million, four hundred ninety-six thousand, six hundred forty".