1851345 has 12 divisors (see below), whose sum is σ = 3209076. Its totient is φ = 987360.

The previous prime is 1851337. The next prime is 1851349. The reversal of 1851345 is 5431581.

It can be written as a sum of positive squares in 2 ways, for example, as 859329 + 992016 = 927^2 + 996^2 .

It is not a de Polignac number, because 1851345 - 2³ = 1851337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1851349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20526 + ... + 20615.

It is an arithmetic number, because the mean of its divisors is an integer number (267423).

2^1851345 is an apocalyptic number.

1851345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1851345 is a deficient number, since it is larger than the sum of its proper divisors (1357731).

1851345 is a wasteful number, since it uses less digits than its factorization.

1851345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41152 (or 41149 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 1851345 is about 1360.6413928732. The cubic root of 1851345 is about 122.7898453833.

The spelling of 1851345 in words is "one million, eight hundred fifty-one thousand, three hundred forty-five".