1388856387 has 4 divisors (see below), whose sum is σ = 1851808520. Its totient is φ = 925904256.

The previous prime is 1388856349. The next prime is 1388856409. The reversal of 1388856387 is 7836588831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1388856387 - 2¹¹ = 1388854339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388854387) 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, 231476062 + ... + 231476067.

It is an arithmetic number, because the mean of its divisors is an integer number (462952130).

Almost surely, 2^1388856387 is an apocalyptic number.

1388856387 is a deficient number, since it is larger than the sum of its proper divisors (462952133).

1388856387 is an equidigital number, since it uses as much as digits as its factorization.

1388856387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462952132.

The product of its digits is 7741440, while the sum is 57.

The square root of 1388856387 is about 37267.3635638477. The cubic root of 1388856387 is about 1115.7128802682.

The spelling of 1388856387 in words is "one billion, three hundred eighty-eight million, eight hundred fifty-six thousand, three hundred eighty-seven".