18025403 has 4 divisors (see below), whose sum is σ = 19664088. Its totient is φ = 16386720.

The previous prime is 18025391. The next prime is 18025411. The reversal of 18025403 is 30452081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30452081 = 11 ⋅2768371.

It is a cyclic number.

It is not a de Polignac number, because 18025403 - 2¹² = 18021307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18025453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819326 + ... + 819347.

It is an arithmetic number, because the mean of its divisors is an integer number (4916022).

Almost surely, 2^18025403 is an apocalyptic number.

18025403 is a deficient number, since it is larger than the sum of its proper divisors (1638685).

18025403 is a wasteful number, since it uses less digits than its factorization.

18025403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638684.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 18025403 is about 4245.6334038633. The cubic root of 18025403 is about 262.1973679389.

Adding to 18025403 its reverse (30452081), we get a palindrome (48477484).

The spelling of 18025403 in words is "eighteen million, twenty-five thousand, four hundred three".