1338721365 has 16 divisors (see below), whose sum is σ = 2191768128. Its totient is φ = 697380096.

The previous prime is 1338721337. The next prime is 1338721421. The reversal of 1338721365 is 5631278331.

It is not a de Polignac number, because 1338721365 - 2¹² = 1338717269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1037124 + ... + 1038413.

It is an arithmetic number, because the mean of its divisors is an integer number (136985508).

Almost surely, 2^1338721365 is an apocalyptic number.

1338721365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1338721365 is a deficient number, since it is larger than the sum of its proper divisors (853046763).

1338721365 is a wasteful number, since it uses less digits than its factorization.

1338721365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075588.

The product of its digits is 90720, while the sum is 39.

The square root of 1338721365 is about 36588.5414440095. The cubic root of 1338721365 is about 1102.1229977787.

Adding to 1338721365 its reverse (5631278331), we get a palindrome (6969999696).

The spelling of 1338721365 in words is "one billion, three hundred thirty-eight million, seven hundred twenty-one thousand, three hundred sixty-five".