18574481 has 4 divisors (see below), whose sum is σ = 19076532. Its totient is φ = 18072432.

The previous prime is 18574469. The next prime is 18574499. The reversal of 18574481 is 18447581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18447581 = 41 ⋅449941.

It can be written as a sum of positive squares in 2 ways, for example, as 7075600 + 11498881 = 2660^2 + 3391^2 .

It is a cyclic number.

It is not a de Polignac number, because 18574481 - 2¹⁴ = 18558097 is a prime.

It is a super-2 number, since 2×18574481² = 690022688838722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18574781) 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, 250970 + ... + 251043.

It is an arithmetic number, because the mean of its divisors is an integer number (4769133).

Almost surely, 2^18574481 is an apocalyptic number.

It is an amenable number.

18574481 is a deficient number, since it is larger than the sum of its proper divisors (502051).

18574481 is an equidigital number, since it uses as much as digits as its factorization.

18574481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502050.

The product of its digits is 35840, while the sum is 38.

The square root of 18574481 is about 4309.8121768820. The cubic root of 18574481 is about 264.8330786937.

The spelling of 18574481 in words is "eighteen million, five hundred seventy-four thousand, four hundred eighty-one".