978891943 has 8 divisors (see below), whose sum is σ = 1064487312. Its totient is φ = 896409216.

The previous prime is 978891931. The next prime is 978891959. The reversal of 978891943 is 349198879.

It is a happy number.

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 978891943 - 2²⁵ = 945337511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978891443) 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, 777505 + ... + 778762.

It is an arithmetic number, because the mean of its divisors is an integer number (133060914).

Almost surely, 2^978891943 is an apocalyptic number.

978891943 is a deficient number, since it is larger than the sum of its proper divisors (85595369).

978891943 is a wasteful number, since it uses less digits than its factorization.

978891943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556321.

The product of its digits is 3919104, while the sum is 58.

The square root of 978891943 is about 31287.2488883251. The cubic root of 978891943 is about 992.9138866019.

The spelling of 978891943 in words is "nine hundred seventy-eight million, eight hundred ninety-one thousand, nine hundred forty-three".