13978575 has 84 divisors (see below), whose sum is σ = 28461720. Its totient is φ = 6765120.

The previous prime is 13978571. The next prime is 13978619. The reversal of 13978575 is 57587931.

13978575 is a `hidden beast` number, since 1 + 3 + 9 + 78 + 575 = 666.

It is not a de Polignac number, because 13978575 - 2² = 13978571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (264600) is a multiple of the sum of its prime factors (100).

It is a self number, because there is not a number n which added to its sum of digits gives 13978575.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978571) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 236896 + ... + 236954.

It is an arithmetic number, because the mean of its divisors is an integer number (338830).

It is a vampire number, since it can be written as 1593 ⋅ 8775 (with its own digits).

Almost surely, 2^13978575 is an apocalyptic number.

13978575 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13978575 is an abundant number, since it is smaller than the sum of its proper divisors (14483145).

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

13978575 is an equidigital number, since it uses as much as digits as its factorization.

13978575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 80 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 13978575 is about 3738.7932545141. The cubic root of 13978575 is about 240.8912176994.

The spelling of 13978575 in words is "thirteen million, nine hundred seventy-eight thousand, five hundred seventy-five".