842731621 has 8 divisors (see below), whose sum is σ = 870683904. Its totient is φ = 814827360.

The previous prime is 842731609. The next prime is 842731639. The reversal of 842731621 is 126137248.

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

It is a cyclic number.

It is not a de Polignac number, because 842731621 - 2⁷ = 842731493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842731601) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 25590 + ... + 48376.

It is an arithmetic number, because the mean of its divisors is an integer number (108835488).

Almost surely, 2^842731621 is an apocalyptic number.

It is an amenable number.

842731621 is a deficient number, since it is larger than the sum of its proper divisors (27952283).

842731621 is a wasteful number, since it uses less digits than its factorization.

842731621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24011.

The product of its digits is 16128, while the sum is 34.

The square root of 842731621 is about 29029.8401821298. The cubic root of 842731621 is about 944.5604633630.

Adding to 842731621 its reverse (126137248), we get a palindrome (968868869).

The spelling of 842731621 in words is "eight hundred forty-two million, seven hundred thirty-one thousand, six hundred twenty-one".