1388138259 has 8 divisors (see below), whose sum is σ = 1856095632. Its totient is φ = 922803200.

The previous prime is 1388138249. The next prime is 1388138267. The reversal of 1388138259 is 9528318831.

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

It is a cyclic number.

It is not a de Polignac number, because 1388138259 - 2¹⁵ = 1388105491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1388138249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654342 + ... + 656459.

It is an arithmetic number, because the mean of its divisors is an integer number (232011954).

Almost surely, 2^1388138259 is an apocalyptic number.

1388138259 is a deficient number, since it is larger than the sum of its proper divisors (467957373).

1388138259 is a wasteful number, since it uses less digits than its factorization.

1388138259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311157.

The product of its digits is 414720, while the sum is 48.

The square root of 1388138259 is about 37257.7275071897. The cubic root of 1388138259 is about 1115.5205486969.

The spelling of 1388138259 in words is "one billion, three hundred eighty-eight million, one hundred thirty-eight thousand, two hundred fifty-nine".