16243978 has 8 divisors (see below), whose sum is σ = 24388740. Its totient is φ = 8114400.

The previous prime is 16243961. The next prime is 16243979. The reversal of 16243978 is 87934261.

It can be written as a sum of positive squares in 2 ways, for example, as 15421329 + 822649 = 3927^2 + 907^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 16243978.

It is not an unprimeable number, because it can be changed into a prime (16243979) 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, 573 + ... + 5728.

Almost surely, 2^16243978 is an apocalyptic number.

16243978 is a deficient number, since it is larger than the sum of its proper divisors (8144762).

16243978 is a wasteful number, since it uses less digits than its factorization.

16243978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7592.

The product of its digits is 72576, while the sum is 40.

The square root of 16243978 is about 4030.3818677639. The cubic root of 16243978 is about 253.2585586486.

The spelling of 16243978 in words is "sixteen million, two hundred forty-three thousand, nine hundred seventy-eight".