1338705945 has 12 divisors (see below), whose sum is σ = 2320423716. Its totient is φ = 713976480.

The previous prime is 1338705943. The next prime is 1338705983. The reversal of 1338705945 is 5495078331.

It can be written as a sum of positive squares in 2 ways, for example, as 594725769 + 743980176 = 24387^2 + 27276^2 .

It is not a de Polignac number, because 1338705945 - 2¹ = 1338705943 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 29749021 = 1338705945 / (1 + 3 + 3 + 8 + 7 + 0 + 5 + 9 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1338705945.

It is not an unprimeable number, because it can be changed into a prime (1338705943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14874466 + ... + 14874555.

It is an arithmetic number, because the mean of its divisors is an integer number (193368643).

Almost surely, 2^1338705945 is an apocalyptic number.

1338705945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1338705945 is a deficient number, since it is larger than the sum of its proper divisors (981717771).

1338705945 is a wasteful number, since it uses less digits than its factorization.

1338705945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29749032 (or 29749029 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 1338705945 is about 36588.3307216932. The cubic root of 1338705945 is about 1102.1187661783.

It can be divided in two parts, 133 and 8705945, that added together give a palindrome (8706078).

The spelling of 1338705945 in words is "one billion, three hundred thirty-eight million, seven hundred five thousand, nine hundred forty-five".