978919 has 4 divisors (see below), whose sum is σ = 987696. Its totient is φ = 970144.

The previous prime is 978917. The next prime is 978931. The reversal of 978919 is 919879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919879 = 107 ⋅8597.

It is a cyclic number.

It is not a de Polignac number, because 978919 - 2¹ = 978917 is a prime.

It is a super-2 number, since 2×978919² = 1916564817122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 4219 + ... + 4444.

It is an arithmetic number, because the mean of its divisors is an integer number (246924).

2⁹⁷⁸⁹¹⁹ is an apocalyptic number.

978919 is a deficient number, since it is larger than the sum of its proper divisors (8777).

978919 is a wasteful number, since it uses less digits than its factorization.

978919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776.

The product of its digits is 40824, while the sum is 43.

The square root of 978919 is about 989.4033555633. The cubic root of 978919 is about 99.2923034709.

The spelling of 978919 in words is "nine hundred seventy-eight thousand, nine hundred nineteen".