978855 has 8 divisors (see below), whose sum is σ = 1566192. Its totient is φ = 522048.

The previous prime is 978853. The next prime is 978863. The reversal of 978855 is 558879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 978855 - 2¹ = 978853 is a prime.

It is a super-2 number, since 2×978855² = 1916314222050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32614 + ... + 32643.

It is an arithmetic number, because the mean of its divisors is an integer number (195774).

2⁹⁷⁸⁸⁵⁵ is an apocalyptic number.

978855 is a deficient number, since it is larger than the sum of its proper divisors (587337).

978855 is a wasteful number, since it uses less digits than its factorization.

978855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65265.

The product of its digits is 100800, while the sum is 42.

The square root of 978855 is about 989.3710123103. The cubic root of 978855 is about 99.2901395717.

The spelling of 978855 in words is "nine hundred seventy-eight thousand, eight hundred fifty-five".