13978906 has 8 divisors (see below), whose sum is σ = 21263904. Its totient is φ = 6890940.

The previous prime is 13978901. The next prime is 13978931. The reversal of 13978906 is 60987931.

13978906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (13978901) 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, 49080 + ... + 49363.

It is an arithmetic number, because the mean of its divisors is an integer number (2657988).

Almost surely, 2^13978906 is an apocalyptic number.

13978906 is a deficient number, since it is larger than the sum of its proper divisors (7284998).

13978906 is an equidigital number, since it uses as much as digits as its factorization.

13978906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98516.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 13978906 is about 3738.8375198717. The cubic root of 13978906 is about 240.8931190464.

It can be divided in two parts, 13978 and 906, that added together give a square (14884 = 122²).

The spelling of 13978906 in words is "thirteen million, nine hundred seventy-eight thousand, nine hundred six".