978751 has 8 divisors (see below), whose sum is σ = 1017360. Its totient is φ = 940992.

The previous prime is 978749. The next prime is 978773. The reversal of 978751 is 157879.

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 978751 - 2¹ = 978749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 978751.

It is a congruent 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, 2971 + ... + 3283.

It is an arithmetic number, because the mean of its divisors is an integer number (127170).

2⁹⁷⁸⁷⁵¹ is an apocalyptic number.

978751 is the 626-th heptagonal number.

978751 is a deficient number, since it is larger than the sum of its proper divisors (38609).

978751 is a wasteful number, since it uses less digits than its factorization.

With its successor (978752) it forms an eRAP, since the sums of their prime factors are consecutive (425 and 426).

978751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425.

The product of its digits is 17640, while the sum is 37.

The square root of 978751 is about 989.3184522690. The cubic root of 978751 is about 99.2866230345.

The spelling of 978751 in words is "nine hundred seventy-eight thousand, seven hundred fifty-one".