862855989 has 4 divisors (see below), whose sum is σ = 1150474656. Its totient is φ = 575237324.

The previous prime is 862855969. The next prime is 862855991. The reversal of 862855989 is 989558268.

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 862855989 - 2⁵ = 862855957 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 (862855969) 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, 143809329 + ... + 143809334.

It is an arithmetic number, because the mean of its divisors is an integer number (287618664).

Almost surely, 2^862855989 is an apocalyptic number.

It is an amenable number.

862855989 is a deficient number, since it is larger than the sum of its proper divisors (287618667).

862855989 is a wasteful number, since it uses less digits than its factorization.

862855989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287618666.

The product of its digits is 12441600, while the sum is 60.

The square root of 862855989 is about 29374.4104451477. The cubic root of 862855989 is about 952.0200741507.

The spelling of 862855989 in words is "eight hundred sixty-two million, eight hundred fifty-five thousand, nine hundred eighty-nine".