1387945009 has 8 divisors (see below), whose sum is σ = 1515083328. Its totient is φ = 1260966960.

The previous prime is 1387945001. The next prime is 1387945037. The reversal of 1387945009 is 9005497831.

It is a happy number.

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

It is not a de Polignac number, because 1387945009 - 2³ = 1387945001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1387945009.

It is not an unprimeable number, because it can be changed into a prime (1387945001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21582 + ... + 56935.

It is an arithmetic number, because the mean of its divisors is an integer number (189385416).

Almost surely, 2^1387945009 is an apocalyptic number.

It is an amenable number.

1387945009 is a deficient number, since it is larger than the sum of its proper divisors (127138319).

1387945009 is a wasteful number, since it uses less digits than its factorization.

1387945009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80135.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1387945009 is about 37255.1339951959. The cubic root of 1387945009 is about 1115.4687804745.

The spelling of 1387945009 in words is "one billion, three hundred eighty-seven million, nine hundred forty-five thousand, nine".