18534407 has 2 divisors, whose sum is σ = 18534408. Its totient is φ = 18534406.

The previous prime is 18534379. The next prime is 18534413. The reversal of 18534407 is 70443581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18534407 - 2¹² = 18530311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18534457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9267203 + 9267204.

It is an arithmetic number, because the mean of its divisors is an integer number (9267204).

Almost surely, 2^18534407 is an apocalyptic number.

18534407 is a deficient number, since it is larger than the sum of its proper divisors (1).

18534407 is an equidigital number, since it uses as much as digits as its factorization.

18534407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 18534407 is about 4305.1605080415. The cubic root of 18534407 is about 264.6424845423.

Adding to 18534407 its reverse (70443581), we get a palindrome (88977988).

The spelling of 18534407 in words is "eighteen million, five hundred thirty-four thousand, four hundred seven".