13878906 has 16 divisors (see below), whose sum is σ = 28138944. Its totient is φ = 4562784.

The previous prime is 13878883. The next prime is 13878923. The reversal of 13878906 is 60987831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15406 + ... + 16281.

It is an arithmetic number, because the mean of its divisors is an integer number (1758684).

Almost surely, 2^13878906 is an apocalyptic number.

13878906 is an abundant number, since it is smaller than the sum of its proper divisors (14260038).

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

13878906 is a wasteful number, since it uses less digits than its factorization.

13878906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31765.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 13878906 is about 3725.4403766535. The cubic root of 13878906 is about 240.3173233120.

The spelling of 13878906 in words is "thirteen million, eight hundred seventy-eight thousand, nine hundred six".