978621 has 8 divisors (see below), whose sum is σ = 1491264. Its totient is φ = 559200.

The previous prime is 978619. The next prime is 978643. The reversal of 978621 is 126879.

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

It is not a de Polignac number, because 978621 - 2¹ = 978619 is a prime.

It is a Curzon number.

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 978621.

It is not an unprimeable number, because it can be changed into a prime (978611) 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, 23280 + ... + 23321.

It is an arithmetic number, because the mean of its divisors is an integer number (186408).

2⁹⁷⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

978621 is a deficient number, since it is larger than the sum of its proper divisors (512643).

978621 is a wasteful number, since it uses less digits than its factorization.

978621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46611.

The product of its digits is 6048, while the sum is 33.

The square root of 978621 is about 989.2527482903. The cubic root of 978621 is about 99.2822270126.

The spelling of 978621 in words is "nine hundred seventy-eight thousand, six hundred twenty-one".