18917430 has 96 divisors (see below), whose sum is σ = 55994976. Its totient is φ = 4064256.

The previous prime is 18917417. The next prime is 18917467. The reversal of 18917430 is 3471981.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18917391 and 18917400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24612 + ... + 25368.

It is an arithmetic number, because the mean of its divisors is an integer number (583281).

Almost surely, 2^18917430 is an apocalyptic number.

18917430 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 18917430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27997488).

18917430 is an abundant number, since it is smaller than the sum of its proper divisors (37077546).

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

18917430 is a wasteful number, since it uses less digits than its factorization.

18917430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 18917430 is about 4349.4172023387. The cubic root of 18917430 is about 266.4530598439.

The spelling of 18917430 in words is "eighteen million, nine hundred seventeen thousand, four hundred thirty".