1198978879 has 16 divisors (see below), whose sum is σ = 1410550848. Its totient is φ = 997880832.

The previous prime is 1198978877. The next prime is 1198978889. The reversal of 1198978879 is 9788798911.

It is a cyclic number.

It is not a de Polignac number, because 1198978879 - 2¹ = 1198978877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198978877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19329 + ... + 52645.

It is an arithmetic number, because the mean of its divisors is an integer number (88159428).

Almost surely, 2^1198978879 is an apocalyptic number.

1198978879 is a deficient number, since it is larger than the sum of its proper divisors (211571969).

1198978879 is an equidigital number, since it uses as much as digits as its factorization.

1198978879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33474.

The product of its digits is 18289152, while the sum is 67.

The square root of 1198978879 is about 34626.2744025400. The cubic root of 1198978879 is about 1062.3570661520.

The spelling of 1198978879 in words is "one billion, one hundred ninety-eight million, nine hundred seventy-eight thousand, eight hundred seventy-nine".