1688145 has 8 divisors (see below), whose sum is σ = 2701056. Its totient is φ = 900336.

The previous prime is 1688143. The next prime is 1688147. The reversal of 1688145 is 5418861.

It is an interprime number because it is at equal distance from previous prime (1688143) and next prime (1688147).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1688145 - 2¹ = 1688143 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1688143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56257 + ... + 56286.

It is an arithmetic number, because the mean of its divisors is an integer number (337632).

2^1688145 is an apocalyptic number.

1688145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1688145 is a deficient number, since it is larger than the sum of its proper divisors (1012911).

1688145 is a wasteful number, since it uses less digits than its factorization.

1688145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112551.

The product of its digits is 7680, while the sum is 33.

The square root of 1688145 is about 1299.2863425743. The cubic root of 1688145 is about 119.0702454644.

The spelling of 1688145 in words is "one million, six hundred eighty-eight thousand, one hundred forty-five".