18912641 has 8 divisors (see below), whose sum is σ = 20671200. Its totient is φ = 17160640.

The previous prime is 18912631. The next prime is 18912643. The reversal of 18912641 is 14621981.

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

It is a cyclic number.

It is not a de Polignac number, because 18912641 - 2⁶ = 18912577 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18912598 and 18912607.

It is not an unprimeable number, because it can be changed into a prime (18912643) 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, 5945 + ... + 8553.

It is an arithmetic number, because the mean of its divisors is an integer number (2583900).

Almost surely, 2^18912641 is an apocalyptic number.

18912641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18912641 is a deficient number, since it is larger than the sum of its proper divisors (1758559).

18912641 is a wasteful number, since it uses less digits than its factorization.

18912641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279.

The product of its digits is 3456, while the sum is 32.

The square root of 18912641 is about 4348.8666339634. The cubic root of 18912641 is about 266.4305735020.

The spelling of 18912641 in words is "eighteen million, nine hundred twelve thousand, six hundred forty-one".