852721 has 4 divisors (see below), whose sum is σ = 870912. Its totient is φ = 834532.

The previous prime is 852689. The next prime is 852749. The reversal of 852721 is 127258.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127258 = 2 ⋅63629.

It is not a de Polignac number, because 852721 - 2⁵ = 852689 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (852751) 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, 9025 + ... + 9118.

It is an arithmetic number, because the mean of its divisors is an integer number (217728).

2⁸⁵²⁷²¹ is an apocalyptic number.

It is an amenable number.

852721 is a deficient number, since it is larger than the sum of its proper divisors (18191).

852721 is a wasteful number, since it uses less digits than its factorization.

852721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18190.

The product of its digits is 1120, while the sum is 25.

The square root of 852721 is about 923.4289360855. The cubic root of 852721 is about 94.8277951457.

Adding to 852721 its reverse (127258), we get a palindrome (979979).

The spelling of 852721 in words is "eight hundred fifty-two thousand, seven hundred twenty-one".