199920786 has 16 divisors (see below), whose sum is σ = 430598784. Its totient is φ = 61514064.

The previous prime is 199920769. The next prime is 199920821. The reversal of 199920786 is 687029991.

It is a happy number.

199920786 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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, 1281466 + ... + 1281621.

It is an arithmetic number, because the mean of its divisors is an integer number (26912424).

Almost surely, 2^199920786 is an apocalyptic number.

199920786 is an abundant number, since it is smaller than the sum of its proper divisors (230677998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199920786 is a wasteful number, since it uses less digits than its factorization.

199920786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563105.

The product of its (nonzero) digits is 489888, while the sum is 51.

The square root of 199920786 is about 14139.3347085356. The cubic root of 199920786 is about 584.7263297334.

The spelling of 199920786 in words is "one hundred ninety-nine million, nine hundred twenty thousand, seven hundred eighty-six".