13955978 has 16 divisors (see below), whose sum is σ = 21517920. Its totient is φ = 6786000.

The previous prime is 13955969. The next prime is 13955999. The reversal of 13955978 is 87955931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11333 + ... + 12503.

It is an arithmetic number, because the mean of its divisors is an integer number (1344870).

Almost surely, 2^13955978 is an apocalyptic number.

13955978 is a deficient number, since it is larger than the sum of its proper divisors (7561942).

13955978 is a wasteful number, since it uses less digits than its factorization.

13955978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333.

The product of its digits is 340200, while the sum is 47.

The square root of 13955978 is about 3735.7700678709. The cubic root of 13955978 is about 240.7613438351.

Subtracting from 13955978 its sum of digits (47), we obtain a palindrome (13955931).

The spelling of 13955978 in words is "thirteen million, nine hundred fifty-five thousand, nine hundred seventy-eight".