18980641 has 4 divisors (see below), whose sum is σ = 19041984. Its totient is φ = 18919300.

The previous prime is 18980629. The next prime is 18980659. The reversal of 18980641 is 14608981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18980641 - 2¹¹ = 18978593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18980641.

It is not an unprimeable number, because it can be changed into a prime (18980141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30205 + ... + 30826.

It is an arithmetic number, because the mean of its divisors is an integer number (4760496).

Almost surely, 2^18980641 is an apocalyptic number.

It is an amenable number.

18980641 is a deficient number, since it is larger than the sum of its proper divisors (61343).

18980641 is an equidigital number, since it uses as much as digits as its factorization.

18980641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61342.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18980641 is about 4356.6777480094. The cubic root of 18980641 is about 266.7495067283.

The spelling of 18980641 in words is "eighteen million, nine hundred eighty thousand, six hundred forty-one".