978715 has 4 divisors (see below), whose sum is σ = 1174464. Its totient is φ = 782968.

The previous prime is 978713. The next prime is 978727. The reversal of 978715 is 517879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 517879 = 113 ⋅4583.

It is a cyclic number.

It is not a de Polignac number, because 978715 - 2¹ = 978713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97867 + ... + 97876.

It is an arithmetic number, because the mean of its divisors is an integer number (293616).

2⁹⁷⁸⁷¹⁵ is an apocalyptic number.

978715 is a deficient number, since it is larger than the sum of its proper divisors (195749).

978715 is a wasteful number, since it uses less digits than its factorization.

978715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195748.

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

The square root of 978715 is about 989.3002577580. The cubic root of 978715 is about 99.2854057135.

The spelling of 978715 in words is "nine hundred seventy-eight thousand, seven hundred fifteen".