842307649 has 4 divisors (see below), whose sum is σ = 862851780. Its totient is φ = 821763520.

The previous prime is 842307617. The next prime is 842307667. The reversal of 842307649 is 946703248.

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 401601600 + 440706049 = 20040^2 + 20993^2 .

It is a cyclic number.

It is not a de Polignac number, because 842307649 - 2⁵ = 842307617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842307689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10272004 + ... + 10272085.

It is an arithmetic number, because the mean of its divisors is an integer number (215712945).

Almost surely, 2^842307649 is an apocalyptic number.

It is an amenable number.

842307649 is a deficient number, since it is larger than the sum of its proper divisors (20544131).

842307649 is a wasteful number, since it uses less digits than its factorization.

842307649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20544130.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 842307649 is about 29022.5369153008. The cubic root of 842307649 is about 944.4020363483.

The spelling of 842307649 in words is "eight hundred forty-two million, three hundred seven thousand, six hundred forty-nine".