18436442 has 16 divisors (see below), whose sum is σ = 28219752. Its totient is φ = 9031680.

The previous prime is 18436433. The next prime is 18436447. The reversal of 18436442 is 24463481.

It can be written as a sum of positive squares in 4 ways, for example, as 17732521 + 703921 = 4211^2 + 839^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18436399 and 18436408.

It is not an unprimeable number, because it can be changed into a prime (18436447) 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, 28442 + ... + 29082.

Almost surely, 2^18436442 is an apocalyptic number.

18436442 is a deficient number, since it is larger than the sum of its proper divisors (9783310).

18436442 is a wasteful number, since it uses less digits than its factorization.

18436442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913.

The product of its digits is 18432, while the sum is 32.

The square root of 18436442 is about 4293.7678092789. The cubic root of 18436442 is about 264.1753980579.

The spelling of 18436442 in words is "eighteen million, four hundred thirty-six thousand, four hundred forty-two".