1388129649 has 8 divisors (see below), whose sum is σ = 1931310912. Its totient is φ = 885184080.

The previous prime is 1388129641. The next prime is 1388129653. The reversal of 1388129649 is 9469218831.

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

It is not a de Polignac number, because 1388129649 - 2³ = 1388129641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1388129641) 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, 10058842 + ... + 10058979.

It is an arithmetic number, because the mean of its divisors is an integer number (241413864).

Almost surely, 2^1388129649 is an apocalyptic number.

It is an amenable number.

1388129649 is a deficient number, since it is larger than the sum of its proper divisors (543181263).

1388129649 is a wasteful number, since it uses less digits than its factorization.

1388129649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20117847.

The product of its digits is 746496, while the sum is 51.

The square root of 1388129649 is about 37257.6119605108. The cubic root of 1388129649 is about 1115.5182423340.

The spelling of 1388129649 in words is "one billion, three hundred eighty-eight million, one hundred twenty-nine thousand, six hundred forty-nine".