16021378 has 8 divisors (see below), whose sum is σ = 25445772. Its totient is φ = 7539456.

The previous prime is 16021367. The next prime is 16021381. The reversal of 16021378 is 87312061.

It can be written as a sum of positive squares in 2 ways, for example, as 15976009 + 45369 = 3997^2 + 213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 235575 + ... + 235642.

Almost surely, 2^16021378 is an apocalyptic number.

16021378 is a deficient number, since it is larger than the sum of its proper divisors (9424394).

16021378 is a wasteful number, since it uses less digits than its factorization.

16021378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471236.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 16021378 is about 4002.6713579808. The cubic root of 16021378 is about 252.0963875003.

The spelling of 16021378 in words is "sixteen million, twenty-one thousand, three hundred seventy-eight".