978881 has 4 divisors (see below), whose sum is σ = 984000. Its totient is φ = 973764.

The previous prime is 978871. The next prime is 978883. The reversal of 978881 is 188879.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 188879 = 19 ⋅9941.

It is a cyclic number.

It is not a de Polignac number, because 978881 - 2¹⁴ = 962497 is a prime.

It is a super-2 number, since 2×978881² = 1916416024322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (978883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2261 + ... + 2658.

It is an arithmetic number, because the mean of its divisors is an integer number (246000).

2⁹⁷⁸⁸⁸¹ is an apocalyptic number.

It is an amenable number.

978881 is a deficient number, since it is larger than the sum of its proper divisors (5119).

978881 is a wasteful number, since it uses less digits than its factorization.

978881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118.

The product of its digits is 32256, while the sum is 41.

The square root of 978881 is about 989.3841518844. The cubic root of 978881 is about 99.2910186671.

The spelling of 978881 in words is "nine hundred seventy-eight thousand, eight hundred eighty-one".