199669820 has 24 divisors (see below), whose sum is σ = 479207904. Its totient is φ = 68458176.

The previous prime is 199669817. The next prime is 199669903. The reversal of 199669820 is 28966991.

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, 712967 + ... + 713246.

It is an arithmetic number, because the mean of its divisors is an integer number (19966996).

Almost surely, 2^199669820 is an apocalyptic number.

199669820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199669820 is an abundant number, since it is smaller than the sum of its proper divisors (279538084).

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

199669820 is a wasteful number, since it uses less digits than its factorization.

199669820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426229 (or 1426227 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 199669820 is about 14130.4571759020. The cubic root of 199669820 is about 584.4815529916.

The spelling of 199669820 in words is "one hundred ninety-nine million, six hundred sixty-nine thousand, eight hundred twenty".