978181879 has 4 divisors (see below), whose sum is σ = 979732720. Its totient is φ = 976631040.

The previous prime is 978181873. The next prime is 978181891.

978181879 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 978181879 - 2⁹ = 978181367 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 (978181873) 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, 774474 + ... + 775735.

It is an arithmetic number, because the mean of its divisors is an integer number (244933180).

Almost surely, 2^978181879 is an apocalyptic number.

978181879 is a deficient number, since it is larger than the sum of its proper divisors (1550841).

978181879 is a wasteful number, since it uses less digits than its factorization.

978181879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550840.

The product of its digits is 2032128, while the sum is 58.

The square root of 978181879 is about 31275.8993315940. The cubic root of 978181879 is about 992.6737501392.

The spelling of 978181879 in words is "nine hundred seventy-eight million, one hundred eighty-one thousand, eight hundred seventy-nine".