842045 has 4 divisors (see below), whose sum is σ = 1010460. Its totient is φ = 673632.

The previous prime is 842041. The next prime is 842047. The reversal of 842045 is 540248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 273529 + 568516 = 523^2 + 754^2 .

It is a cyclic number.

It is not a de Polignac number, because 842045 - 2² = 842041 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 842045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84200 + ... + 84209.

It is an arithmetic number, because the mean of its divisors is an integer number (252615).

2⁸⁴²⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

842045 is a deficient number, since it is larger than the sum of its proper divisors (168415).

842045 is a wasteful number, since it uses less digits than its factorization.

842045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168414.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 842045 is about 917.6300997679. The cubic root of 842045 is about 94.4303864761.

The spelling of 842045 in words is "eight hundred forty-two thousand, forty-five".