780198979 has 8 divisors (see below), whose sum is σ = 920419328. Its totient is φ = 647169480.

The previous prime is 780198911. The next prime is 780198989. The reversal of 780198979 is 979891087.

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 780198979 - 2¹¹ = 780196931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780198989) 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, 1797477 + ... + 1797910.

It is an arithmetic number, because the mean of its divisors is an integer number (115052416).

Almost surely, 2^780198979 is an apocalyptic number.

780198979 is a deficient number, since it is larger than the sum of its proper divisors (140220349).

780198979 is a wasteful number, since it uses less digits than its factorization.

780198979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3595425.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The square root of 780198979 is about 27932.0421559184. The cubic root of 780198979 is about 920.5946765685.

The spelling of 780198979 in words is "seven hundred eighty million, one hundred ninety-eight thousand, nine hundred seventy-nine".