845399 has 4 divisors (see below), whose sum is σ = 859320. Its totient is φ = 831480.

The previous prime is 845387. The next prime is 845431. The reversal of 845399 is 993548.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 845399.

It is not an unprimeable number, because it can be changed into a prime (845309) 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, 6869 + ... + 6990.

It is an arithmetic number, because the mean of its divisors is an integer number (214830).

2⁸⁴⁵³⁹⁹ is an apocalyptic number.

845399 is a deficient number, since it is larger than the sum of its proper divisors (13921).

845399 is a wasteful number, since it uses less digits than its factorization.

845399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13920.

The product of its digits is 38880, while the sum is 38.

The square root of 845399 is about 919.4558173180. The cubic root of 845399 is about 94.5555974919. Note that the first 4 decimals are identical.

It can be divided in two parts, 84539 and 9, that added together give a palindrome (84548).

The spelling of 845399 in words is "eight hundred forty-five thousand, three hundred ninety-nine".