978811 has 4 divisors (see below), whose sum is σ = 1021392. Its totient is φ = 936232.

The previous prime is 978799. The next prime is 978821. The reversal of 978811 is 118879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118879 = 53 ⋅2243.

It is a cyclic number.

It is not a de Polignac number, because 978811 - 2⁷ = 978683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978821) 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, 21256 + ... + 21301.

It is an arithmetic number, because the mean of its divisors is an integer number (255348).

2⁹⁷⁸⁸¹¹ is an apocalyptic number.

978811 is a deficient number, since it is larger than the sum of its proper divisors (42581).

978811 is a wasteful number, since it uses less digits than its factorization.

978811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42580.

The product of its digits is 4032, while the sum is 34.

The square root of 978811 is about 989.3487757106. The cubic root of 978811 is about 99.2886518364.

The spelling of 978811 in words is "nine hundred seventy-eight thousand, eight hundred eleven".