18430042 has 8 divisors (see below), whose sum is σ = 27717300. Its totient is φ = 9190944.

The previous prime is 18430037. The next prime is 18430043. The reversal of 18430042 is 24003481.

It can be written as a sum of positive squares in 2 ways, for example, as 14891881 + 3538161 = 3859^2 + 1881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18429995 and 18430022.

It is not an unprimeable number, because it can be changed into a prime (18430043) 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 3 ways as a sum of consecutive naturals, for example, 11067 + ... + 12622.

Almost surely, 2^18430042 is an apocalyptic number.

18430042 is a deficient number, since it is larger than the sum of its proper divisors (9287258).

18430042 is a wasteful number, since it uses less digits than its factorization.

18430042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24080.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 18430042 is about 4293.0224783944. The cubic root of 18430042 is about 264.1448260306.

The spelling of 18430042 in words is "eighteen million, four hundred thirty thousand, forty-two".