870913 has 4 divisors (see below), whose sum is σ = 872788. Its totient is φ = 869040.

The previous prime is 870911. The next prime is 870917. The reversal of 870913 is 319078.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319078 = 2 ⋅159539.

It can be written as a sum of positive squares in 2 ways, for example, as 242064 + 628849 = 492^2 + 793^2 .

It is a cyclic number.

It is not a de Polignac number, because 870913 - 2¹ = 870911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (218197).

2⁸⁷⁰⁹¹³ is an apocalyptic number.

It is an amenable number.

870913 is a deficient number, since it is larger than the sum of its proper divisors (1875).

870913 is a wasteful number, since it uses less digits than its factorization.

870913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 870913 is about 933.2271963461. The cubic root of 870913 is about 95.4974095402.

The spelling of 870913 in words is "eight hundred seventy thousand, nine hundred thirteen".