18488513 has 4 divisors (see below), whose sum is σ = 18505728. Its totient is φ = 18471300.

The previous prime is 18488497. The next prime is 18488521. The reversal of 18488513 is 31588481.

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: 31588481 = 647 ⋅48823.

It is a cyclic number.

It is not a de Polignac number, because 18488513 - 2⁴ = 18488497 is a prime.

It is a super-2 number, since 2×18488513² = 683650225902338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18488543) 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, 6881 + ... + 9182.

It is an arithmetic number, because the mean of its divisors is an integer number (4626432).

Almost surely, 2^18488513 is an apocalyptic number.

It is an amenable number.

18488513 is a deficient number, since it is larger than the sum of its proper divisors (17215).

18488513 is a wasteful number, since it uses less digits than its factorization.

18488513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17214.

The product of its digits is 30720, while the sum is 38.

The square root of 18488513 is about 4299.8270895467. The cubic root of 18488513 is about 264.4238723741.

The spelling of 18488513 in words is "eighteen million, four hundred eighty-eight thousand, five hundred thirteen".