1138378311 has 24 divisors (see below), whose sum is σ = 1939851264. Its totient is φ = 629516880.

The previous prime is 1138378309. The next prime is 1138378357. The reversal of 1138378311 is 1138738311.

It is a happy number.

It is not a de Polignac number, because 1138378311 - 2¹ = 1138378309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138378511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 289491 + ... + 293396.

It is an arithmetic number, because the mean of its divisors is an integer number (80827136).

Almost surely, 2^1138378311 is an apocalyptic number.

1138378311 is a deficient number, since it is larger than the sum of its proper divisors (801472953).

1138378311 is a wasteful number, since it uses less digits than its factorization.

1138378311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582931 (or 582928 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1138378311 is about 33739.8623441175. The cubic root of 1138378311 is about 1044.1483445125.

Subtracting 1138378311 from its reverse (1138738311), we obtain a square (360000 = 600²).

The spelling of 1138378311 in words is "one billion, one hundred thirty-eight million, three hundred seventy-eight thousand, three hundred eleven".