2158745 has 16 divisors (see below), whose sum is σ = 2779920. Its totient is φ = 1603584.

The previous prime is 2158733. The next prime is 2158753. The reversal of 2158745 is 5478512.

It can be written as a sum of positive squares in 8 ways, for example, as 784 + 2157961 = 28^2 + 1469^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158745 - 2¹⁰ = 2157721 is a prime.

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, 9149 + ... + 9381.

It is an arithmetic number, because the mean of its divisors is an integer number (173745).

2^2158745 is an apocalyptic number.

It is an amenable number.

2158745 is a deficient number, since it is larger than the sum of its proper divisors (621175).

2158745 is a wasteful number, since it uses less digits than its factorization.

2158745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its digits is 11200, while the sum is 32.

The square root of 2158745 is about 1469.2668239636. The cubic root of 2158745 is about 129.2410412226.

The spelling of 2158745 in words is "two million, one hundred fifty-eight thousand, seven hundred forty-five".