16121378 has 32 divisors (see below), whose sum is σ = 29963136. Its totient is φ = 6334848.

The previous prime is 16121363. The next prime is 16121387. The reversal of 16121378 is 87312161.

It is a self number, because there is not a number n which added to its sum of digits gives 16121378.

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, 51350 + ... + 51662.

It is an arithmetic number, because the mean of its divisors is an integer number (936348).

Almost surely, 2^16121378 is an apocalyptic number.

16121378 is a deficient number, since it is larger than the sum of its proper divisors (13841758).

16121378 is a wasteful number, since it uses less digits than its factorization.

16121378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618.

The product of its digits is 2016, while the sum is 29.

The square root of 16121378 is about 4015.1435839830. The cubic root of 16121378 is about 252.6198000280.

The spelling of 16121378 in words is "sixteen million, one hundred twenty-one thousand, three hundred seventy-eight".