842281781 has 8 divisors (see below), whose sum is σ = 958803264. Its totient is φ = 732418720.

The previous prime is 842281763. The next prime is 842281831. The reversal of 842281781 is 187182248.

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

It is a de Polignac number, because none of the positive numbers 2^k-842281781 is a prime.

It is a super-2 number, since 2×842281781² = 1418877197209063922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842281751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1664336 + ... + 1664841.

It is an arithmetic number, because the mean of its divisors is an integer number (119850408).

Almost surely, 2^842281781 is an apocalyptic number.

It is an amenable number.

842281781 is a deficient number, since it is larger than the sum of its proper divisors (116521483).

842281781 is a wasteful number, since it uses less digits than its factorization.

842281781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329211.

The product of its digits is 57344, while the sum is 41.

The square root of 842281781 is about 29022.0912582123. The cubic root of 842281781 is about 944.3923684468.

The spelling of 842281781 in words is "eight hundred forty-two million, two hundred eighty-one thousand, seven hundred eighty-one".