18726440 has 32 divisors (see below), whose sum is σ = 43276680. Its totient is φ = 7287552.

The previous prime is 18726427. The next prime is 18726479. The reversal of 18726440 is 4462781.

It can be written as a sum of positive squares in 4 ways, for example, as 12802084 + 5924356 = 3578^2 + 2434^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18726397 and 18726406.

It is an unprimeable number.

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, 4847 + ... + 7806.

Almost surely, 2^18726440 is an apocalyptic number.

18726440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18726440 is an abundant number, since it is smaller than the sum of its proper divisors (24550240).

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

18726440 is a wasteful number, since it uses less digits than its factorization.

18726440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12701 (or 12697 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 18726440 is about 4327.4056893247. The cubic root of 18726440 is about 265.5533234979.

The spelling of 18726440 in words is "eighteen million, seven hundred twenty-six thousand, four hundred forty".