1338278990420 has 12 divisors (see below), whose sum is σ = 2810385879924. Its totient is φ = 535311596160.

The previous prime is 1338278990393. The next prime is 1338278990429. The reversal of 1338278990420 is 240998728331.

It can be written as a sum of positive squares in 2 ways, for example, as 571750724164 + 766528266256 = 756142^2 + 875516^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338278990429) 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, 33456974741 + ... + 33456974780.

It is an arithmetic number, because the mean of its divisors is an integer number (234198823327).

Almost surely, 2^{1338278990420} is an apocalyptic number.

1338278990420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1338278990420 is an abundant number, since it is smaller than the sum of its proper divisors (1472106889504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1338278990420 is a wasteful number, since it uses less digits than its factorization.

1338278990420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66913949530 (or 66913949528 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 1338278990420 in words is "one trillion, three hundred thirty-eight billion, two hundred seventy-eight million, nine hundred ninety thousand, four hundred twenty".