18122503 has 12 divisors (see below), whose sum is σ = 21219960. Its totient is φ = 15431472.

The previous prime is 18122501. The next prime is 18122509. The reversal of 18122503 is 30522181.

It is not a de Polignac number, because 18122503 - 2¹ = 18122501 is a prime.

It is a super-2 number, since 2×18122503² = 656850229970018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6853 + ... + 9121.

It is an arithmetic number, because the mean of its divisors is an integer number (1768330).

Almost surely, 2^18122503 is an apocalyptic number.

18122503 is a deficient number, since it is larger than the sum of its proper divisors (3097457).

18122503 is a wasteful number, since it uses less digits than its factorization.

18122503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18122503 is about 4257.0533236031. The cubic root of 18122503 is about 262.6673303498.

Adding to 18122503 its reverse (30522181), we get a palindrome (48644684).

The spelling of 18122503 in words is "eighteen million, one hundred twenty-two thousand, five hundred three".