18877089 has 96 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 8363520.

The previous prime is 18877081. The next prime is 18877091. The reversal of 18877089 is 98077881.

It is not a de Polignac number, because 18877089 - 2³ = 18877081 is a prime.

It is a super-2 number, since 2×18877089² = 712688978227842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18877081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 820732 + ... + 820754.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^18877089 is an apocalyptic number.

18877089 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18877089 is a deficient number, since it is larger than the sum of its proper divisors (17894751).

18877089 is a wasteful number, since it uses less digits than its factorization.

18877089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 18877089 is about 4344.7772094781. Note that the first 3 decimals coincide. The cubic root of 18877089 is about 266.2635233053.

It can be divided in two parts, 188 and 77089, that added together give a palindrome (77277).

The spelling of 18877089 in words is "eighteen million, eight hundred seventy-seven thousand, eighty-nine".