2155345 has 8 divisors (see below), whose sum is σ = 2738664. Its totient is φ = 1622784.

The previous prime is 2155333. The next prime is 2155381. The reversal of 2155345 is 5435512.

It can be written as a sum of positive squares in 4 ways, for example, as 294849 + 1860496 = 543^2 + 1364^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2155345 - 2¹¹ = 2153297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12594 + ... + 12763.

It is an arithmetic number, because the mean of its divisors is an integer number (342333).

2^2155345 is an apocalyptic number.

It is an amenable number.

2155345 is a deficient number, since it is larger than the sum of its proper divisors (583319).

2155345 is a wasteful number, since it uses less digits than its factorization.

2155345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25379.

The product of its digits is 3000, while the sum is 25.

The square root of 2155345 is about 1468.1093283540. The cubic root of 2155345 is about 129.1731544897.

It can be divided in two parts, 2155 and 345, that added together give a square (2500 = 50²).

The spelling of 2155345 in words is "two million, one hundred fifty-five thousand, three hundred forty-five".