18506407 has 2 divisors, whose sum is σ = 18506408. Its totient is φ = 18506406.

The previous prime is 18506351. The next prime is 18506417. The reversal of 18506407 is 70460581.

It is a strong prime.

It is an emirp because it is prime and its reverse (70460581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18506407 - 2¹⁹ = 17982119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18506417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9253203 + 9253204.

It is an arithmetic number, because the mean of its divisors is an integer number (9253204).

Almost surely, 2^18506407 is an apocalyptic number.

18506407 is a deficient number, since it is larger than the sum of its proper divisors (1).

18506407 is an equidigital number, since it uses as much as digits as its factorization.

18506407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 18506407 is about 4301.9073676684. The cubic root of 18506407 is about 264.5091519043.

Adding to 18506407 its reverse (70460581), we get a palindrome (88966988).

The spelling of 18506407 in words is "eighteen million, five hundred six thousand, four hundred seven".