18761641 has 6 divisors (see below), whose sum is σ = 19232126. Its totient is φ = 18302400.

The previous prime is 18761623. The next prime is 18761647. The reversal of 18761641 is 14616781.

It can be written as a sum of positive squares in 3 ways, for example, as 4161600 + 14600041 = 2040^2 + 3821^2 .

It is not a de Polignac number, because 18761641 - 2⁷ = 18761513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18761597 and 18761606.

It is not an unprimeable number, because it can be changed into a prime (18761647) 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 5 ways as a sum of consecutive naturals, for example, 3900 + ... + 7261.

Almost surely, 2^18761641 is an apocalyptic number.

It is an amenable number.

18761641 is a deficient number, since it is larger than the sum of its proper divisors (470485).

18761641 is an equidigital number, since it uses as much as digits as its factorization.

18761641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11243 (or 11202 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 18761641 is about 4331.4709972479. The cubic root of 18761641 is about 265.7196105144.

The spelling of 18761641 in words is "eighteen million, seven hundred sixty-one thousand, six hundred forty-one".