1665888 has 96 divisors (see below), whose sum is σ = 5209344. Its totient is φ = 456192.

The previous prime is 1665877. The next prime is 1665889. The reversal of 1665888 is 8885661.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24831 + ... + 24897.

It is an arithmetic number, because the mean of its divisors is an integer number (54264).

2^1665888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2604672).

1665888 is an abundant number, since it is smaller than the sum of its proper divisors (3543456).

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

1665888 is a wasteful number, since it uses less digits than its factorization.

1665888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 116 counting only the distinct ones).

The product of its digits is 92160, while the sum is 42.

The square root of 1665888 is about 1290.6928372002. The cubic root of 1665888 is about 118.5446430451.

The spelling of 1665888 in words is "one million, six hundred sixty-five thousand, eight hundred eighty-eight".