978634 has 16 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 461104.

The previous prime is 978619. The next prime is 978643. The reversal of 978634 is 436879.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 978593 and 978602.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2547 + ... + 2905.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2⁹⁷⁸⁶³⁴ is an apocalyptic number.

978634 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

978634 is a deficient number, since it is larger than the sum of its proper divisors (576566).

978634 is a wasteful number, since it uses less digits than its factorization.

978634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its digits is 36288, while the sum is 37.

The square root of 978634 is about 989.2593188846. The cubic root of 978634 is about 99.2826666323.

The spelling of 978634 in words is "nine hundred seventy-eight thousand, six hundred thirty-four".