18252389 has 4 divisors (see below), whose sum is σ = 18333024. Its totient is φ = 18171756.

The previous prime is 18252379. The next prime is 18252391. The reversal of 18252389 is 98325281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98325281 = 8461 ⋅11621.

It is a cyclic number.

It is not a de Polignac number, because 18252389 - 2¹⁶ = 18186853 is a prime.

It is a super-3 number, since 3×18252389³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18252329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39977 + ... + 40430.

It is an arithmetic number, because the mean of its divisors is an integer number (4583256).

Almost surely, 2^18252389 is an apocalyptic number.

It is an amenable number.

18252389 is a deficient number, since it is larger than the sum of its proper divisors (80635).

18252389 is an equidigital number, since it uses as much as digits as its factorization.

18252389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80634.

The product of its digits is 34560, while the sum is 38.

The square root of 18252389 is about 4272.2814748094. The cubic root of 18252389 is about 263.2933591336.

The spelling of 18252389 in words is "eighteen million, two hundred fifty-two thousand, three hundred eighty-nine".