978455 has 4 divisors (see below), whose sum is σ = 1174152. Its totient is φ = 782760.

The previous prime is 978449. The next prime is 978457. The reversal of 978455 is 554879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554879 = 13 ⋅42683.

It is not a de Polignac number, because 978455 - 2¹² = 974359 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 978455.

It is not an unprimeable number, because it can be changed into a prime (978457) 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, 97841 + ... + 97850.

It is an arithmetic number, because the mean of its divisors is an integer number (293538).

2⁹⁷⁸⁴⁵⁵ is an apocalyptic number.

978455 is a deficient number, since it is larger than the sum of its proper divisors (195697).

978455 is a wasteful number, since it uses less digits than its factorization.

978455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195696.

The product of its digits is 50400, while the sum is 38.

The square root of 978455 is about 989.1688430192. The cubic root of 978455 is about 99.2766130648.

The spelling of 978455 in words is "nine hundred seventy-eight thousand, four hundred fifty-five".