978629 has 4 divisors (see below), whose sum is σ = 1002540. Its totient is φ = 954720.

The previous prime is 978619. The next prime is 978643. The reversal of 978629 is 926879.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 362404 + 616225 = 602^2 + 785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 23869 = 978629 / (9 + 7 + 8 + 6 + 2 + 9).

It is a Duffinian number.

It is a nialpdrome in base 16.

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 978629.

It is not an unprimeable number, because it can be changed into a prime (978619) 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, 11894 + ... + 11975.

It is an arithmetic number, because the mean of its divisors is an integer number (250635).

2⁹⁷⁸⁶²⁹ is an apocalyptic number.

It is an amenable number.

978629 is a deficient number, since it is larger than the sum of its proper divisors (23911).

978629 is a wasteful number, since it uses less digits than its factorization.

978629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23910.

The product of its digits is 54432, while the sum is 41.

The square root of 978629 is about 989.2567917381. The cubic root of 978629 is about 99.2824975482.

The spelling of 978629 in words is "nine hundred seventy-eight thousand, six hundred twenty-nine".