978155 has 8 divisors (see below), whose sum is σ = 1188432. Its totient is φ = 772768.

The previous prime is 978151. The next prime is 978157. The reversal of 978155 is 551879.

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

It is a cyclic number.

It is not a de Polignac number, because 978155 - 2² = 978151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978151) 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, 764 + ... + 1593.

It is an arithmetic number, because the mean of its divisors is an integer number (148554).

2⁹⁷⁸¹⁵⁵ is an apocalyptic number.

978155 is a deficient number, since it is larger than the sum of its proper divisors (210277).

978155 is a wasteful number, since it uses less digits than its factorization.

978155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445.

The product of its digits is 12600, while the sum is 35.

The square root of 978155 is about 989.0171889305. The cubic root of 978155 is about 99.2664657651.

The spelling of 978155 in words is "nine hundred seventy-eight thousand, one hundred fifty-five".