18000407 has 2 divisors, whose sum is σ = 18000408. Its totient is φ = 18000406.

The previous prime is 18000403. The next prime is 18000439. The reversal of 18000407 is 70400081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18000407 - 2² = 18000403 is a prime.

18000407 is a modest number, since divided by 407 gives 18 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18000401) 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 as a sum of consecutive naturals, namely, 9000203 + 9000204.

It is an arithmetic number, because the mean of its divisors is an integer number (9000204).

Almost surely, 2^18000407 is an apocalyptic number.

18000407 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000407 is an equidigital number, since it uses as much as digits as its factorization.

18000407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 18000407 is about 4242.6886522581. The cubic root of 18000407 is about 262.0761146685.

Adding to 18000407 its reverse (70400081), we get a palindrome (88400488).

The spelling of 18000407 in words is "eighteen million, four hundred seven", and thus it is an aban number.