18468438 has 8 divisors (see below), whose sum is σ = 36936888. Its totient is φ = 6156144.

The previous prime is 18468431. The next prime is 18468469. The reversal of 18468438 is 83486481.

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

18468438 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18468438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18468431) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1539031 + ... + 1539042.

It is an arithmetic number, because the mean of its divisors is an integer number (4617111).

Almost surely, 2^18468438 is an apocalyptic number.

18468438 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.

18468438 is a wasteful number, since it uses less digits than its factorization.

18468438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3078078.

The product of its digits is 147456, while the sum is 42.

The square root of 18468438 is about 4297.4920593295. The cubic root of 18468438 is about 264.3281330779.

The spelling of 18468438 in words is "eighteen million, four hundred sixty-eight thousand, four hundred thirty-eight".