1388906189 has 16 divisors (see below), whose sum is σ = 1556029440. Its totient is φ = 1229046000.

The previous prime is 1388906179. The next prime is 1388906219. The reversal of 1388906189 is 9816098831.

It is a cyclic number.

It is not a de Polignac number, because 1388906189 - 2⁴ = 1388906173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388906189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388906179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50444 + ... + 72954.

It is an arithmetic number, because the mean of its divisors is an integer number (97251840).

Almost surely, 2^1388906189 is an apocalyptic number.

It is an amenable number.

1388906189 is a deficient number, since it is larger than the sum of its proper divisors (167123251).

1388906189 is a wasteful number, since it uses less digits than its factorization.

1388906189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22672.

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 1388906189 is about 37268.0317296205. The cubic root of 1388906189 is about 1115.7262159568.

The spelling of 1388906189 in words is "one billion, three hundred eighty-eight million, nine hundred six thousand, one hundred eighty-nine".