1198978878 has 32 divisors (see below), whose sum is σ = 2499858432. Its totient is φ = 382932000.

The previous prime is 1198978877. The next prime is 1198978889. The reversal of 1198978878 is 8788798911.

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, 13126 + ... + 50697.

It is an arithmetic number, because the mean of its divisors is an integer number (78120576).

Almost surely, 2^1198978878 is an apocalyptic number.

1198978878 is an abundant number, since it is smaller than the sum of its proper divisors (1300879554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1198978878 is a wasteful number, since it uses less digits than its factorization.

1198978878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63960.

The product of its digits is 16257024, while the sum is 66.

The square root of 1198978878 is about 34626.2743881001. The cubic root of 1198978878 is about 1062.3570658567.

The spelling of 1198978878 in words is "one billion, one hundred ninety-eight million, nine hundred seventy-eight thousand, eight hundred seventy-eight".