855139443 has 8 divisors (see below), whose sum is σ = 1179502800. Its totient is φ = 550434528.

The previous prime is 855139421. The next prime is 855139477. The reversal of 855139443 is 344931558.

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

It is not a de Polignac number, because 855139443 - 2¹⁰ = 855138419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 855139395 and 855139404.

It is not an unprimeable number, because it can be changed into a prime (855139543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4914508 + ... + 4914681.

It is an arithmetic number, because the mean of its divisors is an integer number (147437850).

Almost surely, 2^855139443 is an apocalyptic number.

855139443 is a deficient number, since it is larger than the sum of its proper divisors (324363357).

855139443 is a wasteful number, since it uses less digits than its factorization.

855139443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9829221.

The product of its digits is 259200, while the sum is 42.

The square root of 855139443 is about 29242.7673622043. The cubic root of 855139443 is about 949.1735908221.

The spelling of 855139443 in words is "eight hundred fifty-five million, one hundred thirty-nine thousand, four hundred forty-three".