1855145 has 4 divisors (see below), whose sum is σ = 2226180. Its totient is φ = 1484112.

The previous prime is 1855123. The next prime is 1855153. The reversal of 1855145 is 5415581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 434281 + 1420864 = 659^2 + 1192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855145 - 2⁸ = 1854889 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185510 + ... + 185519.

It is an arithmetic number, because the mean of its divisors is an integer number (556545).

2^1855145 is an apocalyptic number.

It is an amenable number.

1855145 is a deficient number, since it is larger than the sum of its proper divisors (371035).

1855145 is an equidigital number, since it uses as much as digits as its factorization.

1855145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371034.

The product of its digits is 4000, while the sum is 29.

The square root of 1855145 is about 1362.0370773221. The cubic root of 1855145 is about 122.8737992174.

The spelling of 1855145 in words is "one million, eight hundred fifty-five thousand, one hundred forty-five".