978913 has 8 divisors (see below), whose sum is σ = 1061928. Its totient is φ = 897024.

The previous prime is 978907. The next prime is 978917. The reversal of 978913 is 319879.

It can be written as a sum of positive squares in 4 ways, for example, as 506944 + 471969 = 712^2 + 687^2 .

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 978913 - 2¹³ = 970721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978917) 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, 3195 + ... + 3487.

It is an arithmetic number, because the mean of its divisors is an integer number (132741).

2⁹⁷⁸⁹¹³ is an apocalyptic number.

It is an amenable number.

978913 is a deficient number, since it is larger than the sum of its proper divisors (83015).

978913 is a wasteful number, since it uses less digits than its factorization.

978913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563.

The product of its digits is 13608, while the sum is 37.

The square root of 978913 is about 989.4003234283. The cubic root of 978913 is about 99.2921006093.

It can be divided in two parts, 978 and 913, that added together give a triangular number (1891 = T₆₁).

The spelling of 978913 in words is "nine hundred seventy-eight thousand, nine hundred thirteen".