18889605 has 48 divisors (see below), whose sum is σ = 38822784. Its totient is φ = 8631360.

The previous prime is 18889603. The next prime is 18889631. The reversal of 18889605 is 50698881.

It is not a de Polignac number, because 18889605 - 2¹ = 18889603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18889603) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7395 + ... + 9615.

It is an arithmetic number, because the mean of its divisors is an integer number (808808).

Almost surely, 2^18889605 is an apocalyptic number.

18889605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18889605 is an abundant number, since it is smaller than the sum of its proper divisors (19933179).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18889605 is an equidigital number, since it uses as much as digits as its factorization.

18889605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248 (or 2236 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 18889605 is about 4346.2173208435. The cubic root of 18889605 is about 266.3223568469.

The spelling of 18889605 in words is "eighteen million, eight hundred eighty-nine thousand, six hundred five".