1278538839100 has 36 divisors (see below), whose sum is σ = 2819911741528. Its totient is φ = 503031672000.

The previous prime is 1278538839077. The next prime is 1278538839101. The reversal of 1278538839100 is 19388358721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278538839101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104792166 + ... + 104804365.

Almost surely, 2^{1278538839100} is an apocalyptic number.

1278538839100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278538839100 is an abundant number, since it is smaller than the sum of its proper divisors (1541372902428).

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

1278538839100 is a wasteful number, since it uses less digits than its factorization.

1278538839100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209596606 (or 209596599 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 1278538839100 in words is "one trillion, two hundred seventy-eight billion, five hundred thirty-eight million, eight hundred thirty-nine thousand, one hundred".