842390521 has 8 divisors (see below), whose sum is σ = 995929920. Its totient is φ = 697150608.

The previous prime is 842390519. The next prime is 842390537. The reversal of 842390521 is 125093248.

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

It is not a de Polignac number, because 842390521 - 2¹ = 842390519 is a prime.

It is a super-3 number, since 3×842390521³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842394521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2074651 + ... + 2075056.

It is an arithmetic number, because the mean of its divisors is an integer number (124491240).

Almost surely, 2^842390521 is an apocalyptic number.

It is an amenable number.

842390521 is a deficient number, since it is larger than the sum of its proper divisors (153539399).

842390521 is a wasteful number, since it uses less digits than its factorization.

842390521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149743.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 842390521 is about 29023.9645982419. The cubic root of 842390521 is about 944.4330075811.

The spelling of 842390521 in words is "eight hundred forty-two million, three hundred ninety thousand, five hundred twenty-one".