16119978 has 64 divisors (see below), whose sum is σ = 39564288. Its totient is φ = 4273920.

The previous prime is 16119959. The next prime is 16119979. The reversal of 16119978 is 87991161.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16119979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76293 + ... + 76503.

It is an arithmetic number, because the mean of its divisors is an integer number (618192).

Almost surely, 2^16119978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16119978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19782144).

16119978 is an abundant number, since it is smaller than the sum of its proper divisors (23444310).

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

16119978 is a wasteful number, since it uses less digits than its factorization.

16119978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347.

The product of its digits is 27216, while the sum is 42.

The square root of 16119978 is about 4014.9692402309. The cubic root of 16119978 is about 252.6124872131.

The spelling of 16119978 in words is "sixteen million, one hundred nineteen thousand, nine hundred seventy-eight".