18387906 has 8 divisors (see below), whose sum is σ = 36775824. Its totient is φ = 6129300.

The previous prime is 18387883. The next prime is 18387917. The reversal of 18387906 is 60978381.

It is a sphenic number, since it is the product of 3 distinct primes.

18387906 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1532320 + ... + 1532331.

It is an arithmetic number, because the mean of its divisors is an integer number (4596978).

Almost surely, 2^18387906 is an apocalyptic number.

18387906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18387906 is a wasteful number, since it uses less digits than its factorization.

18387906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064656.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18387906 is about 4288.1121720403. The cubic root of 18387906 is about 263.9433705441.

The spelling of 18387906 in words is "eighteen million, three hundred eighty-seven thousand, nine hundred six".