856940489 has 8 divisors (see below), whose sum is σ = 902520000. Its totient is φ = 811408752.

The previous prime is 856940473. The next prime is 856940537. The reversal of 856940489 is 984049658.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856940489 - 2⁴ = 856940473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856940489.

It is not an unprimeable number, because it can be changed into a prime (856910489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28412 + ... + 50210.

It is an arithmetic number, because the mean of its divisors is an integer number (112815000).

Almost surely, 2^856940489 is an apocalyptic number.

It is an amenable number.

856940489 is a deficient number, since it is larger than the sum of its proper divisors (45579511).

856940489 is a wasteful number, since it uses less digits than its factorization.

856940489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23887.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 856940489 is about 29273.5458904452. The cubic root of 856940489 is about 949.8394886711.

The spelling of 856940489 in words is "eight hundred fifty-six million, nine hundred forty thousand, four hundred eighty-nine".