1318198878 has 48 divisors (see below), whose sum is σ = 2880224880. Its totient is φ = 435704832.

The previous prime is 1318198877. The next prime is 1318198919. The reversal of 1318198878 is 8788918131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318198877) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2129253 + ... + 2129871.

It is an arithmetic number, because the mean of its divisors is an integer number (60004685).

Almost surely, 2^1318198878 is an apocalyptic number.

1318198878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1318198878 is an abundant number, since it is smaller than the sum of its proper divisors (1562026002).

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

1318198878 is a wasteful number, since it uses less digits than its factorization.

1318198878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1430 counting only the distinct ones).

The product of its digits is 774144, while the sum is 54.

The square root of 1318198878 is about 36307.0086622404. The cubic root of 1318198878 is about 1096.4621538036.

The spelling of 1318198878 in words is "one billion, three hundred eighteen million, one hundred ninety-eight thousand, eight hundred seventy-eight".