978215 has 16 divisors (see below), whose sum is σ = 1413120. Its totient is φ = 635040.

The previous prime is 978209. The next prime is 978217. The reversal of 978215 is 512879.

It is not a de Polignac number, because 978215 - 2⁶ = 978151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978217) 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 15 ways as a sum of consecutive naturals, for example, 71 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (88320).

2⁹⁷⁸²¹⁵ is an apocalyptic number.

978215 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

978215 is a deficient number, since it is larger than the sum of its proper divisors (434905).

978215 is a wasteful number, since it uses less digits than its factorization.

978215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502.

The product of its digits is 5040, while the sum is 32.

The square root of 978215 is about 989.0475216085. The cubic root of 978215 is about 99.2684953910.

The spelling of 978215 in words is "nine hundred seventy-eight thousand, two hundred fifteen".