855390845 has 4 divisors (see below), whose sum is σ = 1026469020. Its totient is φ = 684312672.

The previous prime is 855390841. The next prime is 855390857. The reversal of 855390845 is 548093558.

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 132963961 + 722426884 = 11531^2 + 26878^2 .

It is a cyclic number.

It is not a de Polignac number, because 855390845 - 2² = 855390841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855390845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855390841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85539080 + ... + 85539089.

It is an arithmetic number, because the mean of its divisors is an integer number (256617255).

Almost surely, 2^855390845 is an apocalyptic number.

It is an amenable number.

855390845 is a deficient number, since it is larger than the sum of its proper divisors (171078175).

855390845 is a wasteful number, since it uses less digits than its factorization.

855390845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171078174.

The product of its (nonzero) digits is 864000, while the sum is 47.

The square root of 855390845 is about 29247.0655793021. The cubic root of 855390845 is about 949.2665973918.

The spelling of 855390845 in words is "eight hundred fifty-five million, three hundred ninety thousand, eight hundred forty-five".