858009609 has 12 divisors (see below), whose sum is σ = 1248265200. Its totient is φ = 567890424.

The previous prime is 858009569. The next prime is 858009611. The reversal of 858009609 is 906900858.

858009609 is a `hidden beast` number, since 8 + 580 + 0 + 9 + 60 + 9 = 666.

It is not a de Polignac number, because 858009609 - 2¹⁵ = 857976841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (858009629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341679 + ... + 344180.

It is an arithmetic number, because the mean of its divisors is an integer number (104022100).

Almost surely, 2^858009609 is an apocalyptic number.

It is an amenable number.

858009609 is a deficient number, since it is larger than the sum of its proper divisors (390255591).

858009609 is a wasteful number, since it uses less digits than its factorization.

858009609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686004 (or 686001 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 858009609 is about 29291.8010542199. The cubic root of 858009609 is about 950.2343314830.

The spelling of 858009609 in words is "eight hundred fifty-eight million, nine thousand, six hundred nine".