13878522 has 48 divisors (see below), whose sum is σ = 35867520. Its totient is φ = 3792096.

The previous prime is 13878521. The next prime is 13878523. The reversal of 13878522 is 22587831.

It is an interprime number because it is at equal distance from previous prime (13878521) and next prime (13878523).

It is a super-2 number, since 2×13878522² = 385226745808968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13878521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 504 + ... + 5292.

It is an arithmetic number, because the mean of its divisors is an integer number (747240).

Almost surely, 2^13878522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13878522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17933760).

13878522 is an abundant number, since it is smaller than the sum of its proper divisors (21988998).

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

13878522 is a wasteful number, since it uses less digits than its factorization.

13878522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827 (or 4824 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 13878522 is about 3725.3888387657. The cubic root of 13878522 is about 240.3151069340.

It can be divided in two parts, 13878 and 522, that added together give a square (14400 = 120²).

The spelling of 13878522 in words is "thirteen million, eight hundred seventy-eight thousand, five hundred twenty-two".