13978626 has 16 divisors (see below), whose sum is σ = 28060128. Its totient is φ = 4642400.

The previous prime is 13978621. The next prime is 13978633. The reversal of 13978626 is 62687931.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (13978621) 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, 2460 + ... + 5831.

It is an arithmetic number, because the mean of its divisors is an integer number (1753758).

Almost surely, 2^13978626 is an apocalyptic number.

13978626 is an abundant number, since it is smaller than the sum of its proper divisors (14081502).

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

13978626 is a wasteful number, since it uses less digits than its factorization.

13978626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8577.

The product of its digits is 108864, while the sum is 42.

The square root of 13978626 is about 3738.8000748903. The cubic root of 13978626 is about 240.8915106582.

The spelling of 13978626 in words is "thirteen million, nine hundred seventy-eight thousand, six hundred twenty-six".