13938440 has 16 divisors (see below), whose sum is σ = 31361580. Its totient is φ = 5575360.

The previous prime is 13938409. The next prime is 13938451. The reversal of 13938440 is 4483931.

It can be written as a sum of positive squares in 2 ways, for example, as 12802084 + 1136356 = 3578^2 + 1066^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13938397 and 13938406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174191 + ... + 174270.

Almost surely, 2^13938440 is an apocalyptic number.

13938440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13938440 is an abundant number, since it is smaller than the sum of its proper divisors (17423140).

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

13938440 is a wasteful number, since it uses less digits than its factorization.

13938440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348472 (or 348468 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 13938440 is about 3733.4220227561. The cubic root of 13938440 is about 240.6604493789.

The spelling of 13938440 in words is "thirteen million, nine hundred thirty-eight thousand, four hundred forty".