1338978885 has 16 divisors (see below), whose sum is σ = 2163168384. Its totient is φ = 707188032.

The previous prime is 1338978881. The next prime is 1338978913. The reversal of 1338978885 is 5888798331.

It is not a de Polignac number, because 1338978885 - 2² = 1338978881 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338978881) 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 15 ways as a sum of consecutive naturals, for example, 431782 + ... + 434871.

It is an arithmetic number, because the mean of its divisors is an integer number (135198024).

Almost surely, 2^1338978885 is an apocalyptic number.

1338978885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1338978885 is a deficient number, since it is larger than the sum of its proper divisors (824189499).

1338978885 is a wasteful number, since it uses less digits than its factorization.

1338978885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866764.

The product of its digits is 11612160, while the sum is 60.

The square root of 1338978885 is about 36592.0604093292. The cubic root of 1338978885 is about 1102.1936623509.

The spelling of 1338978885 in words is "one billion, three hundred thirty-eight million, nine hundred seventy-eight thousand, eight hundred eighty-five".