1338781904 has 20 divisors (see below), whose sum is σ = 2594925060. Its totient is φ = 669123840.

The previous prime is 1338781901. The next prime is 1338781931. The reversal of 1338781904 is 4091878331.

It can be written as a sum of positive squares in 2 ways, for example, as 1316238400 + 22543504 = 36280^2 + 4748^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338781901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28334 + ... + 58994.

It is an arithmetic number, because the mean of its divisors is an integer number (129746253).

Almost surely, 2^1338781904 is an apocalyptic number.

It is an amenable number.

1338781904 is a deficient number, since it is larger than the sum of its proper divisors (1256143156).

1338781904 is a wasteful number, since it uses less digits than its factorization.

1338781904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33398 (or 33392 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 1338781904 is about 36589.3687291814. The cubic root of 1338781904 is about 1102.1396107499.

The spelling of 1338781904 in words is "one billion, three hundred thirty-eight million, seven hundred eighty-one thousand, nine hundred four".