18025021 has 8 divisors (see below), whose sum is σ = 20737664. Its totient is φ = 15346800.

The previous prime is 18025019. The next prime is 18025061. The reversal of 18025021 is 12052081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18025021 - 2¹ = 18025019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18025021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18025001) 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 in 7 ways as a sum of consecutive naturals, for example, 7470 + ... + 9583.

It is an arithmetic number, because the mean of its divisors is an integer number (2592208).

Almost surely, 2^18025021 is an apocalyptic number.

It is an amenable number.

18025021 is a deficient number, since it is larger than the sum of its proper divisors (2712643).

18025021 is a wasteful number, since it uses less digits than its factorization.

18025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17211.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18025021 is about 4245.5884162269. The cubic root of 18025021 is about 262.1955157361.

The spelling of 18025021 in words is "eighteen million, twenty-five thousand, twenty-one".