855749042 has 4 divisors (see below), whose sum is σ = 1283623566. Its totient is φ = 427874520.

The previous prime is 855749033. The next prime is 855749071. The reversal of 855749042 is 240947558.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240947558 = 2 ⋅120473779.

It can be written as a sum of positive squares in only one way, i.e., 854919121 + 829921 = 29239^2 + 911^2 .

It is a junction number, because it is equal to n+sod(n) for n = 855748984 and 855749002.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 213937259 + ... + 213937262.

Almost surely, 2^855749042 is an apocalyptic number.

855749042 is a deficient number, since it is larger than the sum of its proper divisors (427874524).

855749042 is a wasteful number, since it uses less digits than its factorization.

855749042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427874523.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 855749042 is about 29253.1885783413. The cubic root of 855749042 is about 949.3990814675.

The spelling of 855749042 in words is "eight hundred fifty-five million, seven hundred forty-nine thousand, forty-two".