858440489 has 4 divisors (see below), whose sum is σ = 859612356. Its totient is φ = 857268624.

The previous prime is 858440447. The next prime is 858440491. The reversal of 858440489 is 984044858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984044858 = 2 ⋅492022429.

It can be written as a sum of positive squares in 2 ways, for example, as 438190489 + 420250000 = 20933^2 + 20500^2 .

It is a cyclic number.

It is not a de Polignac number, because 858440489 - 2²⁸ = 590005033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858440389) 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, 584834 + ... + 586299.

It is an arithmetic number, because the mean of its divisors is an integer number (214903089).

Almost surely, 2^858440489 is an apocalyptic number.

It is an amenable number.

858440489 is a deficient number, since it is larger than the sum of its proper divisors (1171867).

858440489 is a wasteful number, since it uses less digits than its factorization.

858440489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171866.

The product of its (nonzero) digits is 1474560, while the sum is 50.

The square root of 858440489 is about 29299.1550902070. The cubic root of 858440489 is about 950.3933695037.

The spelling of 858440489 in words is "eight hundred fifty-eight million, four hundred forty thousand, four hundred eighty-nine".