18487541 has 4 divisors (see below), whose sum is σ = 18553152. Its totient is φ = 18421932.

The previous prime is 18487519. The next prime is 18487543. The reversal of 18487541 is 14578481.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18487541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18487495 and 18487504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18487543) 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, 32381 + ... + 32946.

It is an arithmetic number, because the mean of its divisors is an integer number (4638288).

Almost surely, 2^18487541 is an apocalyptic number.

It is an amenable number.

18487541 is a deficient number, since it is larger than the sum of its proper divisors (65611).

18487541 is an equidigital number, since it uses as much as digits as its factorization.

18487541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65610.

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

The square root of 18487541 is about 4299.7140602603. The cubic root of 18487541 is about 264.4192384246.

The spelling of 18487541 in words is "eighteen million, four hundred eighty-seven thousand, five hundred forty-one".