18763641 has 12 divisors (see below), whose sum is σ = 29188068. Its totient is φ = 11546784.

The previous prime is 18763639. The next prime is 18763663. The reversal of 18763641 is 14636781.

18763641 is a `hidden beast` number, since 1 + 8 + 7 + 6 + 3 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1299600 + 17464041 = 1140^2 + 4179^2 .

It is not a de Polignac number, because 18763641 - 2¹ = 18763639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18763596 and 18763605.

It is not an unprimeable number, because it can be changed into a prime (18763601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80070 + ... + 80303.

It is an arithmetic number, because the mean of its divisors is an integer number (2432339).

Almost surely, 2^18763641 is an apocalyptic number.

It is an amenable number.

18763641 is a deficient number, since it is larger than the sum of its proper divisors (10424427).

18763641 is a wasteful number, since it uses less digits than its factorization.

18763641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160392 (or 160389 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 18763641 is about 4331.7018595467. The cubic root of 18763641 is about 265.7290521252.

The spelling of 18763641 in words is "eighteen million, seven hundred sixty-three thousand, six hundred forty-one".