845140789 has 4 divisors (see below), whose sum is σ = 847406956. Its totient is φ = 842874624.

The previous prime is 845140757. The next prime is 845140801. The reversal of 845140789 is 987041548.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 421480900 + 423659889 = 20530^2 + 20583^2 .

It is a cyclic number.

It is not a de Polignac number, because 845140789 - 2⁵ = 845140757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845120789) 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, 1132524 + ... + 1133269.

It is an arithmetic number, because the mean of its divisors is an integer number (211851739).

Almost surely, 2^845140789 is an apocalyptic number.

It is an amenable number.

845140789 is a deficient number, since it is larger than the sum of its proper divisors (2266167).

845140789 is a wasteful number, since it uses less digits than its factorization.

845140789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266166.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 845140789 is about 29071.3052510547. The cubic root of 845140789 is about 945.4596977706.

The spelling of 845140789 in words is "eight hundred forty-five million, one hundred forty thousand, seven hundred eighty-nine".