18474481 has 4 divisors (see below), whose sum is σ = 19070464. Its totient is φ = 17878500.

The previous prime is 18474457. The next prime is 18474487. The reversal of 18474481 is 18447481.

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: 18447481 = 13 ⋅1419037.

It is a cyclic number.

It is not a de Polignac number, because 18474481 - 2⁹ = 18473969 is a prime.

It is a super-2 number, since 2×18474481² = 682612896438722, 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 18474481.

It is not an unprimeable number, because it can be changed into a prime (18474487) 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, 297945 + ... + 298006.

It is an arithmetic number, because the mean of its divisors is an integer number (4767616).

Almost surely, 2^18474481 is an apocalyptic number.

It is an amenable number.

18474481 is a deficient number, since it is larger than the sum of its proper divisors (595983).

18474481 is an equidigital number, since it uses as much as digits as its factorization.

18474481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595982.

The product of its digits is 28672, while the sum is 37.

The square root of 18474481 is about 4298.1950863124. The cubic root of 18474481 is about 264.3569599287.

Subtracting from 18474481 its reverse (18447481), we obtain a cube (27000 = 30³).

It can be divided in two parts, 1847 and 4481, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 18474481 in words is "eighteen million, four hundred seventy-four thousand, four hundred eighty-one".