13135978 has 8 divisors (see below), whose sum is σ = 19719360. Its totient is φ = 6562860.

The previous prime is 13135963. The next prime is 13135979. The reversal of 13135978 is 87953131.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (13135979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3583 + ... + 6253.

It is an arithmetic number, because the mean of its divisors is an integer number (2464920).

Almost surely, 2^13135978 is an apocalyptic number.

13135978 is a deficient number, since it is larger than the sum of its proper divisors (6583382).

13135978 is a wasteful number, since it uses less digits than its factorization.

13135978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132.

The product of its digits is 22680, while the sum is 37.

The square root of 13135978 is about 3624.3589778056. The cubic root of 13135978 is about 235.9504468401.

The spelling of 13135978 in words is "thirteen million, one hundred thirty-five thousand, nine hundred seventy-eight".