859540409 has 12 divisors (see below), whose sum is σ = 1076787684. Its totient is φ = 680075424.

The previous prime is 859540399. The next prime is 859540421. The reversal of 859540409 is 904045958.

It can be written as a sum of positive squares in 2 ways, for example, as 187279225 + 672261184 = 13685^2 + 25928^2 .

It is not a de Polignac number, because 859540409 - 2⁴ = 859540393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 859540409.

It is not an unprimeable number, because it can be changed into a prime (859540499) 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, 674042 + ... + 675315.

It is an arithmetic number, because the mean of its divisors is an integer number (89732307).

Almost surely, 2^859540409 is an apocalyptic number.

It is an amenable number.

859540409 is a deficient number, since it is larger than the sum of its proper divisors (217247275).

859540409 is a wasteful number, since it uses less digits than its factorization.

859540409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349384 (or 1349377 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 859540409 is about 29317.9195885383. The cubic root of 859540409 is about 950.7991093440.

The spelling of 859540409 in words is "eight hundred fifty-nine million, five hundred forty thousand, four hundred nine".