1378099817 has 4 divisors (see below), whose sum is σ = 1415345796. Its totient is φ = 1340853840.

The previous prime is 1378099813. The next prime is 1378099859. The reversal of 1378099817 is 7189908731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7189908731 = 19 ⋅378416249.

It can be written as a sum of positive squares in 2 ways, for example, as 580376281 + 797723536 = 24091^2 + 28244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378099817 - 2² = 1378099813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378099813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18622934 + ... + 18623007.

It is an arithmetic number, because the mean of its divisors is an integer number (353836449).

Almost surely, 2^1378099817 is an apocalyptic number.

It is an amenable number.

1378099817 is a deficient number, since it is larger than the sum of its proper divisors (37245979).

1378099817 is an equidigital number, since it uses as much as digits as its factorization.

1378099817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37245978.

The product of its (nonzero) digits is 762048, while the sum is 53.

The square root of 1378099817 is about 37122.7668284572. The cubic root of 1378099817 is about 1112.8250461553.

The spelling of 1378099817 in words is "one billion, three hundred seventy-eight million, ninety-nine thousand, eight hundred seventeen".