858252309 has 4 divisors (see below), whose sum is σ = 1144336416. Its totient is φ = 572168204.

The previous prime is 858252281. The next prime is 858252319. The reversal of 858252309 is 903252858.

858252309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 858252309 - 2²⁴ = 841475093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858252319) 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, 143042049 + ... + 143042054.

It is an arithmetic number, because the mean of its divisors is an integer number (286084104).

Almost surely, 2^858252309 is an apocalyptic number.

It is an amenable number.

858252309 is a deficient number, since it is larger than the sum of its proper divisors (286084107).

858252309 is a wasteful number, since it uses less digits than its factorization.

858252309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286084106.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 858252309 is about 29295.9435587933. The cubic root of 858252309 is about 950.3239187200.

The spelling of 858252309 in words is "eight hundred fifty-eight million, two hundred fifty-two thousand, three hundred nine".