13261978 has 8 divisors (see below), whose sum is σ = 20268468. Its totient is φ = 6505824.

The previous prime is 13261907. The next prime is 13261999. The reversal of 13261978 is 87916231.

13261978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12694969 + 567009 = 3563^2 + 753^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62451 + ... + 62662.

Almost surely, 2^13261978 is an apocalyptic number.

13261978 is a deficient number, since it is larger than the sum of its proper divisors (7006490).

13261978 is a wasteful number, since it uses less digits than its factorization.

13261978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125168.

The product of its digits is 18144, while the sum is 37.

The square root of 13261978 is about 3641.6998778043. The cubic root of 13261978 is about 236.7024579430.

The spelling of 13261978 in words is "thirteen million, two hundred sixty-one thousand, nine hundred seventy-eight".