13938643490 has 16 divisors (see below), whose sum is σ = 25093334520. Its totient is φ = 5574618240.

The previous prime is 13938643489. The next prime is 13938643513. The reversal of 13938643490 is 9434683931.

It can be written as a sum of positive squares in 4 ways, for example, as 3693357529 + 10245285961 = 60773^2 + 101219^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32771 + ... + 170150.

Almost surely, 2^13938643490 is an apocalyptic number.

13938643490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13938643490 is a deficient number, since it is larger than the sum of its proper divisors (11154691030).

13938643490 is a wasteful number, since it uses less digits than its factorization.

13938643490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209797.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 13938643490 in words is "thirteen billion, nine hundred thirty-eight million, six hundred forty-three thousand, four hundred ninety".