1287376385 has 16 divisors (see below), whose sum is σ = 1561389696. Its totient is φ = 1018902528.

The previous prime is 1287376379. The next prime is 1287376393. The reversal of 1287376385 is 5836737821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1287376385 - 2¹⁰ = 1287375361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615812 + ... + 617898.

It is an arithmetic number, because the mean of its divisors is an integer number (97586856).

Almost surely, 2^1287376385 is an apocalyptic number.

It is an amenable number.

1287376385 is a deficient number, since it is larger than the sum of its proper divisors (274013311).

1287376385 is a wasteful number, since it uses less digits than its factorization.

1287376385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352.

The product of its digits is 1693440, while the sum is 50.

The square root of 1287376385 is about 35880.0276616393. The cubic root of 1287376385 is about 1087.8487393456.

The spelling of 1287376385 in words is "one billion, two hundred eighty-seven million, three hundred seventy-six thousand, three hundred eighty-five".