862121 has 16 divisors (see below), whose sum is σ = 1016064. Its totient is φ = 724224.

The previous prime is 862117. The next prime is 862123. The reversal of 862121 is 121268.

It is a cyclic number.

It is not a de Polignac number, because 862121 - 2² = 862117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 862093 and 862102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (862123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10346 + ... + 10428.

It is an arithmetic number, because the mean of its divisors is an integer number (63504).

2⁸⁶²¹²¹ is an apocalyptic number.

It is an amenable number.

862121 is a deficient number, since it is larger than the sum of its proper divisors (153943).

862121 is a wasteful number, since it uses less digits than its factorization.

862121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160.

The product of its digits is 192, while the sum is 20.

The square root of 862121 is about 928.5047118890. The cubic root of 862121 is about 95.1749684088.

Adding to 862121 its reverse (121268), we get a palindrome (983389).

The spelling of 862121 in words is "eight hundred sixty-two thousand, one hundred twenty-one".