1388965189 has 6 divisors (see below), whose sum is σ = 1465916550. Its totient is φ = 1315861416.

The previous prime is 1388965187. The next prime is 1388965247. The reversal of 1388965189 is 9815698831.

It can be written as a sum of positive squares in only one way, i.e., 792872964 + 596092225 = 28158^2 + 24415^2 .

It is not a de Polignac number, because 1388965189 - 2¹ = 1388965187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388965187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1923414 + ... + 1924135.

It is an arithmetic number, because the mean of its divisors is an integer number (244319425).

Almost surely, 2^1388965189 is an apocalyptic number.

1388965189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1388965189 is a deficient number, since it is larger than the sum of its proper divisors (76951361).

1388965189 is an equidigital number, since it uses as much as digits as its factorization.

1388965189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847587 (or 3847568 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 58.

The square root of 1388965189 is about 37268.8232843485. The cubic root of 1388965189 is about 1115.7420142195.

The spelling of 1388965189 in words is "one billion, three hundred eighty-eight million, nine hundred sixty-five thousand, one hundred eighty-nine".