16011978 has 8 divisors (see below), whose sum is σ = 32023968. Its totient is φ = 5337324.

The previous prime is 16011971. The next prime is 16011997. The reversal of 16011978 is 87911061.

16011978 is digitally balanced in base 2 and base 4, because in such bases 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.

16011978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (16011971) 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, 1334326 + ... + 1334337.

It is an arithmetic number, because the mean of its divisors is an integer number (4002996).

Almost surely, 2^16011978 is an apocalyptic number.

16011978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16011978 is a wasteful number, since it uses less digits than its factorization.

16011978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668668.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 16011978 is about 4001.4969698851. The cubic root of 16011978 is about 252.0470748539.

The spelling of 16011978 in words is "sixteen million, eleven thousand, nine hundred seventy-eight".