13815438 has 32 divisors (see below), whose sum is σ = 34008576. Its totient is φ = 3643488.

The previous prime is 13815437. The next prime is 13815449. The reversal of 13815438 is 83451831.

It is a super-3 number, since 3×13815438³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13815399 and 13815408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13815437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12106 + ... + 13197.

It is an arithmetic number, because the mean of its divisors is an integer number (1062768).

Almost surely, 2^13815438 is an apocalyptic number.

13815438 is an abundant number, since it is smaller than the sum of its proper divisors (20193138).

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

13815438 is a wasteful number, since it uses less digits than its factorization.

13815438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25328.

The product of its digits is 11520, while the sum is 33.

The square root of 13815438 is about 3716.9124283469. The cubic root of 13815438 is about 239.9504411559.

It can be divided in two parts, 138 and 15438, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 13815438 in words is "thirteen million, eight hundred fifteen thousand, four hundred thirty-eight".