199978142 has 32 divisors (see below), whose sum is σ = 381931200. Its totient is φ = 76382208.

The previous prime is 199978133. The next prime is 199978187. The reversal of 199978142 is 241879991.

It is a congruent number.

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, 13667 + ... + 24222.

It is an arithmetic number, because the mean of its divisors is an integer number (11935350).

Almost surely, 2^199978142 is an apocalyptic number.

199978142 is a deficient number, since it is larger than the sum of its proper divisors (181953058).

199978142 is a wasteful number, since it uses less digits than its factorization.

199978142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37940.

The product of its digits is 326592, while the sum is 50.

The square root of 199978142 is about 14141.3628056139. The cubic root of 199978142 is about 584.7822424732.

The spelling of 199978142 in words is "one hundred ninety-nine million, nine hundred seventy-eight thousand, one hundred forty-two".