13858638 has 32 divisors (see below), whose sum is σ = 30896640. Its totient is φ = 4118400.

The previous prime is 13858633. The next prime is 13858661. The reversal of 13858638 is 83685831.

It is a self number, because there is not a number n which added to its sum of digits gives 13858638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13858631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (965520).

Almost surely, 2^13858638 is an apocalyptic number.

13858638 is an abundant number, since it is smaller than the sum of its proper divisors (17038002).

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

13858638 is a wasteful number, since it uses less digits than its factorization.

13858638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7192.

The product of its digits is 138240, while the sum is 42.

The square root of 13858638 is about 3722.7191674903. The cubic root of 13858638 is about 240.2002842017.

The spelling of 13858638 in words is "thirteen million, eight hundred fifty-eight thousand, six hundred thirty-eight".