18943641 has 24 divisors (see below), whose sum is σ = 28533960. Its totient is φ = 12096000.

The previous prime is 18943637. The next prime is 18943643. The reversal of 18943641 is 14634981.

18943641 is a `hidden beast` number, since 1 + 8 + 9 + 4 + 3 + 641 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2975625 + 15968016 = 1725^2 + 3996^2 .

It is not a de Polignac number, because 18943641 - 2² = 18943637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18943596 and 18943605.

It is not an unprimeable number, because it can be changed into a prime (18943643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47041 + ... + 47441.

It is an arithmetic number, because the mean of its divisors is an integer number (1188915).

Almost surely, 2^18943641 is an apocalyptic number.

It is an amenable number.

18943641 is a deficient number, since it is larger than the sum of its proper divisors (9590319).

18943641 is a wasteful number, since it uses less digits than its factorization.

18943641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 614 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18943641 is about 4352.4293216547. The cubic root of 18943641 is about 266.5760641857.

The spelling of 18943641 in words is "eighteen million, nine hundred forty-three thousand, six hundred forty-one".