18890461889 has 12 divisors (see below), whose sum is σ = 20512396800. Its totient is φ = 17388721584.

The previous prime is 18890461859. The next prime is 18890461927. The reversal of 18890461889 is 98816409881.

It is not a de Polignac number, because 18890461889 - 2⁸ = 18890461633 is a prime.

It is a super-2 number, since 2×18890461889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18890461859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95009 + ... + 216350.

It is an arithmetic number, because the mean of its divisors is an integer number (1709366400).

Almost surely, 2^18890461889 is an apocalyptic number.

It is an amenable number.

18890461889 is a deficient number, since it is larger than the sum of its proper divisors (1621934911).

18890461889 is a wasteful number, since it uses less digits than its factorization.

18890461889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311744 (or 311731 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 62.

The spelling of 18890461889 in words is "eighteen billion, eight hundred ninety million, four hundred sixty-one thousand, eight hundred eighty-nine".