18250506 has 24 divisors (see below), whose sum is σ = 40819584. Its totient is φ = 5887080.

The previous prime is 18250499. The next prime is 18250553. The reversal of 18250506 is 60505281.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18250506.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15796 + ... + 16911.

It is an arithmetic number, because the mean of its divisors is an integer number (1700816).

Almost surely, 2^18250506 is an apocalyptic number.

18250506 is an abundant number, since it is smaller than the sum of its proper divisors (22569078).

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

18250506 is a wasteful number, since it uses less digits than its factorization.

18250506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32746 (or 32743 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 18250506 is about 4272.0610950687. The cubic root of 18250506 is about 263.2843046395.

Adding to 18250506 its reverse (60505281), we get a palindrome (78755787).

The spelling of 18250506 in words is "eighteen million, two hundred fifty thousand, five hundred six".