18825481 has 4 divisors (see below), whose sum is σ = 18842832. Its totient is φ = 18808132.

The previous prime is 18825451. The next prime is 18825493. The reversal of 18825481 is 18452881.

It is a happy number.

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: 18452881 = 2971 ⋅6211.

It is a cyclic number.

It is not a de Polignac number, because 18825481 - 2⁵ = 18825449 is a prime.

It is a super-2 number, since 2×18825481² = 708797469762722, which contains 22 as substring.

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 18825481.

It is not an unprimeable number, because it can be changed into a prime (18825421) 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, 6931 + ... + 9256.

It is an arithmetic number, because the mean of its divisors is an integer number (4710708).

Almost surely, 2^18825481 is an apocalyptic number.

It is an amenable number.

18825481 is a deficient number, since it is larger than the sum of its proper divisors (17351).

18825481 is a wasteful number, since it uses less digits than its factorization.

18825481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17350.

The product of its digits is 20480, while the sum is 37.

The square root of 18825481 is about 4338.8340599751. The cubic root of 18825481 is about 266.0206562435.

It can be divided in two parts, 18825 and 481, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 18825481 in words is "eighteen million, eight hundred twenty-five thousand, four hundred eighty-one".