1378787889 has 8 divisors (see below), whose sum is σ = 1839088960. Its totient is φ = 918839376.

The previous prime is 1378787881. The next prime is 1378787897. The reversal of 1378787889 is 9887878731.

It is an interprime number because it is at equal distance from previous prime (1378787881) and next prime (1378787897).

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

It is not a de Polignac number, because 1378787889 - 2³ = 1378787881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378787881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78874 + ... + 94755.

It is an arithmetic number, because the mean of its divisors is an integer number (229886120).

Almost surely, 2^1378787889 is an apocalyptic number.

It is an amenable number.

1378787889 is a deficient number, since it is larger than the sum of its proper divisors (460301071).

1378787889 is a wasteful number, since it uses less digits than its factorization.

1378787889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176279.

The product of its digits is 37933056, while the sum is 66.

The square root of 1378787889 is about 37132.0331923799. The cubic root of 1378787889 is about 1113.0102229582.

The spelling of 1378787889 in words is "one billion, three hundred seventy-eight million, seven hundred eighty-seven thousand, eight hundred eighty-nine".