16005978 has 32 divisors (see below), whose sum is σ = 36534720. Its totient is φ = 5190480.

The previous prime is 16005967. The next prime is 16006009. The reversal of 16005978 is 87950061.

16005978 is a `hidden beast` number, since 1 + 60 + 0 + 597 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2008 + ... + 6003.

It is an arithmetic number, because the mean of its divisors is an integer number (1141710).

Almost surely, 2^16005978 is an apocalyptic number.

16005978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16005978 is an abundant number, since it is smaller than the sum of its proper divisors (20528742).

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

16005978 is a wasteful number, since it uses less digits than its factorization.

16005978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8059 (or 8053 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 16005978 is about 4000.7471802152. The cubic root of 16005978 is about 252.0155886048.

The spelling of 16005978 in words is "sixteen million, five thousand, nine hundred seventy-eight".