18813641 has 8 divisors (see below), whose sum is σ = 23456064. Its totient is φ = 14659920.

The previous prime is 18813617. The next prime is 18813643. The reversal of 18813641 is 14631881.

It is a happy number.

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

It is not a de Polignac number, because 18813641 - 2¹⁰ = 18812617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18813598 and 18813607.

It is not an unprimeable number, because it can be changed into a prime (18813643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122090 + ... + 122243.

It is an arithmetic number, because the mean of its divisors is an integer number (2932008).

Almost surely, 2^18813641 is an apocalyptic number.

18813641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18813641 is a deficient number, since it is larger than the sum of its proper divisors (4642423).

18813641 is a wasteful number, since it uses less digits than its factorization.

18813641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244351.

The product of its digits is 4608, while the sum is 32.

The square root of 18813641 is about 4337.4694235234. The cubic root of 18813641 is about 265.9648746654.

The spelling of 18813641 in words is "eighteen million, eight hundred thirteen thousand, six hundred forty-one".