18288993 has 8 divisors (see below), whose sum is σ = 24980256. Its totient is φ = 11895200.

The previous prime is 18288983. The next prime is 18289003. The reversal of 18288993 is 39988281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18288983) and next prime (18289003).

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

It is a cyclic number.

It is not a de Polignac number, because 18288993 - 2⁶ = 18288929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18288913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74223 + ... + 74468.

It is an arithmetic number, because the mean of its divisors is an integer number (3122532).

Almost surely, 2^18288993 is an apocalyptic number.

It is an amenable number.

18288993 is a deficient number, since it is larger than the sum of its proper divisors (6691263).

18288993 is a wasteful number, since it uses less digits than its factorization.

18288993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148735.

The product of its digits is 248832, while the sum is 48.

The square root of 18288993 is about 4276.5632229630. The cubic root of 18288993 is about 263.4692476116.

The spelling of 18288993 in words is "eighteen million, two hundred eighty-eight thousand, nine hundred ninety-three".