1278972385919 has 8 divisors (see below), whose sum is σ = 1346471366640. Its totient is φ = 1211491869696.

The previous prime is 1278972385907. The next prime is 1278972385961. The reversal of 1278972385919 is 9195832798721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1278972385919 - 2⁴⁰ = 179460758143 is a prime.

It is a super-2 number, since 2×1278972385919² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278972385969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4473824 + ... + 4751109.

It is an arithmetic number, because the mean of its divisors is an integer number (168308920830).

Almost surely, 2^{1278972385919} is an apocalyptic number.

1278972385919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1278972385919 is a deficient number, since it is larger than the sum of its proper divisors (67498980721).

1278972385919 is an equidigital number, since it uses as much as digits as its factorization.

1278972385919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9232249.

The product of its digits is 137168640, while the sum is 71.

The spelling of 1278972385919 in words is "one trillion, two hundred seventy-eight billion, nine hundred seventy-two million, three hundred eighty-five thousand, nine hundred nineteen".