18500430 has 96 divisors (see below), whose sum is σ = 49805280. Its totient is φ = 4392960.

The previous prime is 18500413. The next prime is 18500431. The reversal of 18500430 is 3400581.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18500397 and 18500406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207826 + ... + 207914.

It is an arithmetic number, because the mean of its divisors is an integer number (518805).

Almost surely, 2^18500430 is an apocalyptic number.

18500430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18500430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24902640).

18500430 is an abundant number, since it is smaller than the sum of its proper divisors (31304850).

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

18500430 is a wasteful number, since it uses less digits than its factorization.

18500430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 18500430 is about 4301.2126197155. The cubic root of 18500430 is about 264.4806727325.

The spelling of 18500430 in words is "eighteen million, five hundred thousand, four hundred thirty".