18875978 has 16 divisors (see below), whose sum is σ = 30962304. Its totient is φ = 8559360.

The previous prime is 18875971. The next prime is 18876007. The reversal of 18875978 is 87957881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18875971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11951 + ... + 13437.

It is an arithmetic number, because the mean of its divisors is an integer number (1935144).

Almost surely, 2^18875978 is an apocalyptic number.

18875978 is a deficient number, since it is larger than the sum of its proper divisors (12086326).

18875978 is a wasteful number, since it uses less digits than its factorization.

18875978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077.

The product of its digits is 1128960, while the sum is 53.

The square root of 18875978 is about 4344.6493529398. The cubic root of 18875978 is about 266.2582996083.

The spelling of 18875978 in words is "eighteen million, eight hundred seventy-five thousand, nine hundred seventy-eight".