1388987113 has 4 divisors (see below), whose sum is σ = 1389600468. Its totient is φ = 1388373760.

The previous prime is 1388987101. The next prime is 1388987123. The reversal of 1388987113 is 3117898831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 965779929 + 423207184 = 31077^2 + 20572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388987113 - 2⁵ = 1388987081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388987123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303268 + ... + 307813.

It is an arithmetic number, because the mean of its divisors is an integer number (347400117).

Almost surely, 2^1388987113 is an apocalyptic number.

It is an amenable number.

1388987113 is a deficient number, since it is larger than the sum of its proper divisors (613355).

1388987113 is an equidigital number, since it uses as much as digits as its factorization.

1388987113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613354.

The product of its digits is 290304, while the sum is 49.

The square root of 1388987113 is about 37269.1174164347. The cubic root of 1388987113 is about 1115.7478846329.

The spelling of 1388987113 in words is "one billion, three hundred eighty-eight million, nine hundred eighty-seven thousand, one hundred thirteen".