1388728099 has 4 divisors (see below), whose sum is σ = 1514976120. Its totient is φ = 1262480080.

The previous prime is 1388728093. The next prime is 1388728139. The reversal of 1388728099 is 9908278831.

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

It is a cyclic number.

It is not a de Polignac number, because 1388728099 - 2¹⁹ = 1388203811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388728093) 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, 63123994 + ... + 63124015.

It is an arithmetic number, because the mean of its divisors is an integer number (378744030).

Almost surely, 2^1388728099 is an apocalyptic number.

1388728099 is a deficient number, since it is larger than the sum of its proper divisors (126248021).

1388728099 is a wasteful number, since it uses less digits than its factorization.

1388728099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126248020.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 1388728099 is about 37265.6423398283. The cubic root of 1388728099 is about 1115.6785265888.

The spelling of 1388728099 in words is "one billion, three hundred eighty-eight million, seven hundred twenty-eight thousand, ninety-nine".