13978145 has 8 divisors (see below), whose sum is σ = 17352360. Its totient is φ = 10796800.

The previous prime is 13978127. The next prime is 13978147. The reversal of 13978145 is 54187931.

It can be written as a sum of positive squares in 4 ways, for example, as 20449 + 13957696 = 143^2 + 3736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13978145 - 2⁸ = 13977889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13978099 and 13978108.

It is not an unprimeable number, because it can be changed into a prime (13978147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48056 + ... + 48345.

It is an arithmetic number, because the mean of its divisors is an integer number (2169045).

Almost surely, 2^13978145 is an apocalyptic number.

It is an amenable number.

13978145 is a deficient number, since it is larger than the sum of its proper divisors (3374215).

13978145 is an equidigital number, since it uses as much as digits as its factorization.

13978145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96435.

The product of its digits is 30240, while the sum is 38.

The square root of 13978145 is about 3738.7357488862. The cubic root of 13978145 is about 240.8887476268. Note that the first 3 decimals are identical.

The spelling of 13978145 in words is "thirteen million, nine hundred seventy-eight thousand, one hundred forty-five".