1386728907 has 8 divisors (see below), whose sum is σ = 1856709120. Its totient is φ = 920617320.

The previous prime is 1386728869. The next prime is 1386728909. The reversal of 1386728907 is 7098276831.

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

It is a de Polignac number, because none of the positive numbers 2^k-1386728907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1386728907.

It is not an unprimeable number, because it can be changed into a prime (1386728909) 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, 966319 + ... + 967752.

It is an arithmetic number, because the mean of its divisors is an integer number (232088640).

Almost surely, 2^1386728907 is an apocalyptic number.

1386728907 is a deficient number, since it is larger than the sum of its proper divisors (469980213).

1386728907 is a wasteful number, since it uses less digits than its factorization.

1386728907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934313.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The square root of 1386728907 is about 37238.8091512068. The cubic root of 1386728907 is about 1115.1428981594.

The spelling of 1386728907 in words is "one billion, three hundred eighty-six million, seven hundred twenty-eight thousand, nine hundred seven".