845679 has 4 divisors (see below), whose sum is σ = 1127576. Its totient is φ = 563784.

The previous prime is 845659. The next prime is 845683. The reversal of 845679 is 976548.

845679 = T₄₂₉ + T₄₃₀ + ... + T₄₃₇.

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

It is not a de Polignac number, because 845679 - 2⁹ = 845167 is a prime.

It is a D-number.

It is a Duffinian number.

845679 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845659) 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, 140944 + ... + 140949.

It is an arithmetic number, because the mean of its divisors is an integer number (281894).

2⁸⁴⁵⁶⁷⁹ is an apocalyptic number.

845679 is a deficient number, since it is larger than the sum of its proper divisors (281897).

845679 is a wasteful number, since it uses less digits than its factorization.

845679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281896.

The product of its digits is 60480, while the sum is 39.

The square root of 845679 is about 919.6080686901. The cubic root of 845679 is about 94.5660354212.

The spelling of 845679 in words is "eight hundred forty-five thousand, six hundred seventy-nine".