978755 has 4 divisors (see below), whose sum is σ = 1174512. Its totient is φ = 783000.

The previous prime is 978749. The next prime is 978773. The reversal of 978755 is 557879.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 557879 = 7 ⋅79697.

It is a de Polignac number, because none of the positive numbers 2^k-978755 is a prime.

It is a super-2 number, since 2×978755² = 1915922700050, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978755.

It is an unprimeable number.

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, 97871 + ... + 97880.

It is an arithmetic number, because the mean of its divisors is an integer number (293628).

2⁹⁷⁸⁷⁵⁵ is an apocalyptic number.

978755 is a deficient number, since it is larger than the sum of its proper divisors (195757).

978755 is a wasteful number, since it uses less digits than its factorization.

978755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195756.

The product of its digits is 88200, while the sum is 41.

The square root of 978755 is about 989.3204738607. The cubic root of 978755 is about 99.2867582905.

The spelling of 978755 in words is "nine hundred seventy-eight thousand, seven hundred fifty-five".