18025639 has 2 divisors, whose sum is σ = 18025640. Its totient is φ = 18025638.

The previous prime is 18025633. The next prime is 18025649. The reversal of 18025639 is 93652081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18025639 - 2¹¹ = 18023591 is a prime.

It is a super-2 number, since 2×18025639² = 649847322716642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18025633) 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, 9012819 + 9012820.

It is an arithmetic number, because the mean of its divisors is an integer number (9012820).

Almost surely, 2^18025639 is an apocalyptic number.

18025639 is a deficient number, since it is larger than the sum of its proper divisors (1).

18025639 is an equidigital number, since it uses as much as digits as its factorization.

18025639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 18025639 is about 4245.6611970340. The cubic root of 18025639 is about 262.1985122186.

The spelling of 18025639 in words is "eighteen million, twenty-five thousand, six hundred thirty-nine".