18687408 has 40 divisors (see below), whose sum is σ = 50377728. Its totient is φ = 5957952.

The previous prime is 18687407. The next prime is 18687433. The reversal of 18687408 is 80478681.

It is a self number, because there is not a number n which added to its sum of digits gives 18687408.

It is not an unprimeable number, because it can be changed into a prime (18687401) 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, 7360 + ... + 9567.

Almost surely, 2^18687408 is an apocalyptic number.

It is an amenable number.

18687408 is an abundant number, since it is smaller than the sum of its proper divisors (31690320).

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

18687408 is a wasteful number, since it uses less digits than its factorization.

18687408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16961 (or 16955 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 18687408 is about 4322.8934754398. The cubic root of 18687408 is about 265.3686952917.

The spelling of 18687408 in words is "eighteen million, six hundred eighty-seven thousand, four hundred eight".