199782478 has 16 divisors (see below), whose sum is σ = 344786400. Its totient is φ = 85045536.

The previous prime is 199782469. The next prime is 199782481. The reversal of 199782478 is 874287991.

It is a happy number.

199782478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45801 + ... + 49972.

It is an arithmetic number, because the mean of its divisors is an integer number (21549150).

Almost surely, 2^199782478 is an apocalyptic number.

199782478 is a deficient number, since it is larger than the sum of its proper divisors (145003922).

199782478 is a wasteful number, since it uses less digits than its factorization.

199782478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95931.

The product of its digits is 2032128, while the sum is 55.

The square root of 199782478 is about 14134.4429674466. The cubic root of 199782478 is about 584.5914580049.

The spelling of 199782478 in words is "one hundred ninety-nine million, seven hundred eighty-two thousand, four hundred seventy-eight".