855139546 has 4 divisors (see below), whose sum is σ = 1282709322. Its totient is φ = 427569772.

The previous prime is 855139543. The next prime is 855139561. The reversal of 855139546 is 645931558.

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

It can be written as a sum of positive squares in only one way, i.e., 804573225 + 50566321 = 28365^2 + 7111^2 .

It is a super-2 number, since 2×855139546² = 1462527286266172232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 855139496 and 855139505.

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 as a sum of consecutive naturals, namely, 213784885 + ... + 213784888.

Almost surely, 2^855139546 is an apocalyptic number.

855139546 is a deficient number, since it is larger than the sum of its proper divisors (427569776).

855139546 is a wasteful number, since it uses less digits than its factorization.

855139546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427569775.

The product of its digits is 648000, while the sum is 46.

The square root of 855139546 is about 29242.7691233235. The cubic root of 855139546 is about 949.1736289308.

It can be divided in two parts, 85513 and 9546, that added together give a palindrome (95059).

The spelling of 855139546 in words is "eight hundred fifty-five million, one hundred thirty-nine thousand, five hundred forty-six".