13788215438 has 4 divisors (see below), whose sum is σ = 20682323160. Its totient is φ = 6894107718.

The previous prime is 13788215437. The next prime is 13788215471. The reversal of 13788215438 is 83451288731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83451288731 = 5927 ⋅14079853.

It is a super-2 number, since 2×13788215438² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13788215437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3447053858 + ... + 3447053861.

It is an arithmetic number, because the mean of its divisors is an integer number (5170580790).

Almost surely, 2^13788215438 is an apocalyptic number.

13788215438 is a deficient number, since it is larger than the sum of its proper divisors (6894107722).

13788215438 is an equidigital number, since it uses as much as digits as its factorization.

13788215438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894107721.

The product of its digits is 1290240, while the sum is 50.

The spelling of 13788215438 in words is "thirteen billion, seven hundred eighty-eight million, two hundred fifteen thousand, four hundred thirty-eight".