891479 has 4 divisors (see below), whose sum is σ = 893376. Its totient is φ = 889584.

The previous prime is 891439. The next prime is 891481. The reversal of 891479 is 974198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 974198 = 2 ⋅487099.

It is a cyclic number.

It is not a de Polignac number, because 891479 - 2⁸ = 891223 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 891479.

It is not an unprimeable number, because it can be changed into a prime (891409) 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, 347 + ... + 1379.

It is an arithmetic number, because the mean of its divisors is an integer number (223344).

2⁸⁹¹⁴⁷⁹ is an apocalyptic number.

891479 is a deficient number, since it is larger than the sum of its proper divisors (1897).

891479 is a wasteful number, since it uses less digits than its factorization.

891479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896.

The product of its digits is 18144, while the sum is 38.

The square root of 891479 is about 944.1816562505. The cubic root of 891479 is about 96.2432704577.

The spelling of 891479 in words is "eight hundred ninety-one thousand, four hundred seventy-nine".