13920078 has 32 divisors (see below), whose sum is σ = 28739232. Its totient is φ = 4492800.

The previous prime is 13920061. The next prime is 13920113. The reversal of 13920078 is 87002931.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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, 26458 + ... + 26978.

It is an arithmetic number, because the mean of its divisors is an integer number (898101).

Almost surely, 2^13920078 is an apocalyptic number.

13920078 is an abundant number, since it is smaller than the sum of its proper divisors (14819154).

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

13920078 is a wasteful number, since it uses less digits than its factorization.

13920078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 13920078 is about 3730.9620743181. The cubic root of 13920078 is about 240.5547237962.

The spelling of 13920078 in words is "thirteen million, nine hundred twenty thousand, seventy-eight".