199540656 has 60 divisors (see below), whose sum is σ = 638216592. Its totient is φ = 57011328.

The previous prime is 199540639. The next prime is 199540657. The reversal of 199540656 is 656045991.

It is a happy number.

199540656 is a `hidden beast` number, since 199 + 5 + 406 + 56 = 666.

199540656 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (199540657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97971 + ... + 99986.

Almost surely, 2^199540656 is an apocalyptic number.

199540656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

199540656 is an abundant number, since it is smaller than the sum of its proper divisors (438675936).

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

199540656 is a wasteful number, since it uses less digits than its factorization.

199540656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197978 (or 197969 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 199540656 is about 14125.8860253083. The cubic root of 199540656 is about 584.3554944484.

The spelling of 199540656 in words is "one hundred ninety-nine million, five hundred forty thousand, six hundred fifty-six".