18489461 has 4 divisors (see below), whose sum is σ = 18680172. Its totient is φ = 18298752.

The previous prime is 18489433. The next prime is 18489463. The reversal of 18489461 is 16498481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16498481 = 251 ⋅65731.

It can be written as a sum of positive squares in 2 ways, for example, as 9186961 + 9302500 = 3031^2 + 3050^2 .

It is a cyclic number.

It is not a de Polignac number, because 18489461 - 2¹⁸ = 18227317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18489463) 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, 95210 + ... + 95403.

It is an arithmetic number, because the mean of its divisors is an integer number (4670043).

Almost surely, 2^18489461 is an apocalyptic number.

It is an amenable number.

18489461 is a deficient number, since it is larger than the sum of its proper divisors (190711).

18489461 is an equidigital number, since it uses as much as digits as its factorization.

18489461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190710.

The product of its digits is 55296, while the sum is 41.

The square root of 18489461 is about 4299.9373251246. The cubic root of 18489461 is about 264.4283917487.

The spelling of 18489461 in words is "eighteen million, four hundred eighty-nine thousand, four hundred sixty-one".