18640461 has 8 divisors (see below), whose sum is σ = 28404544. Its totient is φ = 10651680.

The previous prime is 18640451. The next prime is 18640469. The reversal of 18640461 is 16404681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18640461 - 2⁵ = 18640429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443800 + ... + 443841.

It is an arithmetic number, because the mean of its divisors is an integer number (3550568).

Almost surely, 2^18640461 is an apocalyptic number.

It is an amenable number.

18640461 is a deficient number, since it is larger than the sum of its proper divisors (9764083).

18640461 is an equidigital number, since it uses as much as digits as its factorization.

18640461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887651.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18640461 is about 4317.4600171860. The cubic root of 18640461 is about 265.1462868589.

The spelling of 18640461 in words is "eighteen million, six hundred forty thousand, four hundred sixty-one".