13881078 has 32 divisors (see below), whose sum is σ = 32663520. Its totient is φ = 4354560.

The previous prime is 13881067. The next prime is 13881079. The reversal of 13881078 is 87018831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881079) 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, 6643 + ... + 8478.

It is an arithmetic number, because the mean of its divisors is an integer number (1020735).

Almost surely, 2^13881078 is an apocalyptic number.

13881078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13881078 is an abundant number, since it is smaller than the sum of its proper divisors (18782442).

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

13881078 is a wasteful number, since it uses less digits than its factorization.

13881078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15149 (or 15143 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 13881078 is about 3725.7318744107. The cubic root of 13881078 is about 240.3298589302.

The spelling of 13881078 in words is "thirteen million, eight hundred eighty-one thousand, seventy-eight".