18393430 has 16 divisors (see below), whose sum is σ = 36118224. Its totient is φ = 6688480.

The previous prime is 18393421. The next prime is 18393437. The reversal of 18393430 is 3439381.

It is a junction number, because it is equal to n+sod(n) for n = 18393392 and 18393401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18393437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83497 + ... + 83716.

It is an arithmetic number, because the mean of its divisors is an integer number (2257389).

Almost surely, 2^18393430 is an apocalyptic number.

18393430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18393430 is a deficient number, since it is larger than the sum of its proper divisors (17724794).

18393430 is a wasteful number, since it uses less digits than its factorization.

18393430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167231.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 18393430 is about 4288.7562299576. The cubic root of 18393430 is about 263.9697987337.

The spelling of 18393430 in words is "eighteen million, three hundred ninety-three thousand, four hundred thirty".