842815049 has 4 divisors (see below), whose sum is σ = 842904960. Its totient is φ = 842725140.

The previous prime is 842815033. The next prime is 842815067. The reversal of 842815049 is 940518248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 842815049 - 2⁴ = 842815033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 842814997 and 842815015.

It is not an unprimeable number, because it can be changed into a prime (842815949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29009 + ... + 50270.

It is an arithmetic number, because the mean of its divisors is an integer number (210726240).

Almost surely, 2^842815049 is an apocalyptic number.

It is an amenable number.

842815049 is a deficient number, since it is larger than the sum of its proper divisors (89911).

842815049 is a wasteful number, since it uses less digits than its factorization.

842815049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89910.

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 842815049 is about 29031.2770817958. The cubic root of 842815049 is about 944.5916319218.

The spelling of 842815049 in words is "eight hundred forty-two million, eight hundred fifteen thousand, forty-nine".