1138720011 has 16 divisors (see below), whose sum is σ = 1783729920. Its totient is φ = 637045920.

The previous prime is 1138719997. The next prime is 1138720021. The reversal of 1138720011 is 1100278311.

It is a happy number.

It is not a de Polignac number, because 1138720011 - 2⁹ = 1138719499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138720021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1326751 + ... + 1327608.

It is an arithmetic number, because the mean of its divisors is an integer number (111483120).

Almost surely, 2^1138720011 is an apocalyptic number.

1138720011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1138720011 is a deficient number, since it is larger than the sum of its proper divisors (645009909).

1138720011 is a wasteful number, since it uses less digits than its factorization.

1138720011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654386.

The product of its (nonzero) digits is 336, while the sum is 24.

The square root of 1138720011 is about 33744.9257074304. The cubic root of 1138720011 is about 1044.2528059186.

Adding to 1138720011 its reverse (1100278311), we get a palindrome (2238998322).

The spelling of 1138720011 in words is "one billion, one hundred thirty-eight million, seven hundred twenty thousand, eleven".