1388188131 has 8 divisors (see below), whose sum is σ = 2019182784. Its totient is φ = 841326120.

The previous prime is 1388188129. The next prime is 1388188133. The reversal of 1388188131 is 1318818831.

1388188131 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1388188129) and next prime (1388188133).

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

It is not a de Polignac number, because 1388188131 - 2¹ = 1388188129 is a prime.

It is a super-2 number, since 2×1388188131² = 3854132574098546322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1388188133) 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, 21033121 + ... + 21033186.

It is an arithmetic number, because the mean of its divisors is an integer number (252397848).

Almost surely, 2^1388188131 is an apocalyptic number.

1388188131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1388188131 is a deficient number, since it is larger than the sum of its proper divisors (630994653).

1388188131 is a wasteful number, since it uses less digits than its factorization.

1388188131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42066321.

The product of its digits is 36864, while the sum is 42.

The square root of 1388188131 is about 37258.3967851543. The cubic root of 1388188131 is about 1115.5339077347.

The spelling of 1388188131 in words is "one billion, three hundred eighty-eight million, one hundred eighty-eight thousand, one hundred thirty-one".