842947491 has 16 divisors (see below), whose sum is σ = 1154916864. Its totient is φ = 546619104.

The previous prime is 842947489. The next prime is 842947507. The reversal of 842947491 is 194749248.

It is not a de Polignac number, because 842947491 - 2¹ = 842947489 is a prime.

It is a super-3 number, since 3×842947491³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 842947491.

It is not an unprimeable number, because it can be changed into a prime (842947411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4645 + ... + 41321.

It is an arithmetic number, because the mean of its divisors is an integer number (72182304).

Almost surely, 2^842947491 is an apocalyptic number.

842947491 is a deficient number, since it is larger than the sum of its proper divisors (311969373).

842947491 is a wasteful number, since it uses less digits than its factorization.

842947491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36890.

The product of its digits is 580608, while the sum is 48.

The square root of 842947491 is about 29033.5580148214. The cubic root of 842947491 is about 944.6411078033.

The spelling of 842947491 in words is "eight hundred forty-two million, nine hundred forty-seven thousand, four hundred ninety-one".