858649 has 4 divisors (see below), whose sum is σ = 936720. Its totient is φ = 780580.

The previous prime is 858631. The next prime is 858673. The reversal of 858649 is 946858.

858649 is nontrivially palindromic in base 3.

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 858649 - 2¹³ = 850457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858149) 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, 39019 + ... + 39040.

It is an arithmetic number, because the mean of its divisors is an integer number (234180).

2⁸⁵⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

858649 is a deficient number, since it is larger than the sum of its proper divisors (78071).

858649 is a wasteful number, since it uses less digits than its factorization.

858649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78070.

The product of its digits is 69120, while the sum is 40.

The square root of 858649 is about 926.6331528712. The cubic root of 858649 is about 95.0470311910.

Subtracting 858649 from its reverse (946858), we obtain a square (88209 = 297²).

The spelling of 858649 in words is "eight hundred fifty-eight thousand, six hundred forty-nine".