842661 has 6 divisors (see below), whose sum is σ = 1217190. Its totient is φ = 561768.

The previous prime is 842657. The next prime is 842701. The reversal of 842661 is 166248.

It can be written as a sum of positive squares in only one way, i.e., 690561 + 152100 = 831^2 + 390^2 .

It is not a de Polignac number, because 842661 - 2² = 842657 is a prime.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46806 + ... + 46823.

It is an arithmetic number, because the mean of its divisors is an integer number (202865).

2⁸⁴²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

842661 is a deficient number, since it is larger than the sum of its proper divisors (374529).

842661 is a wasteful number, since it uses less digits than its factorization.

842661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93635 (or 93632 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 842661 is about 917.9656856332. The cubic root of 842661 is about 94.4534077870.

The spelling of 842661 in words is "eight hundred forty-two thousand, six hundred sixty-one".