1668145 has 16 divisors (see below), whose sum is σ = 2101248. Its totient is φ = 1270080.

The previous prime is 1668137. The next prime is 1668197. The reversal of 1668145 is 5418661.

It is not a de Polignac number, because 1668145 - 2³ = 1668137 is a prime.

It is an Ulam number.

It is a Duffinian number.

Its product of digits (5760) is a multiple of the sum of its prime divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13072 + ... + 13198.

It is an arithmetic number, because the mean of its divisors is an integer number (131328).

2^1668145 is an apocalyptic number.

It is an amenable number.

1668145 is a deficient number, since it is larger than the sum of its proper divisors (433103).

1668145 is a wasteful number, since it uses less digits than its factorization.

1668145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240.

The product of its digits is 5760, while the sum is 31.

The square root of 1668145 is about 1291.5668778658. The cubic root of 1668145 is about 118.5981549497.

It can be divided in two parts, 1668 and 145, that multiplied together give a triangular number (241860 = T₆₉₅).

The spelling of 1668145 in words is "one million, six hundred sixty-eight thousand, one hundred forty-five".