199639953390 has 32 divisors (see below), whose sum is σ = 507320353440. Its totient is φ = 50105713664.

The previous prime is 199639953377. The next prime is 199639953397. The reversal of 199639953390 is 93359936991.

199639953390 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×199639953390² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199639953397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195724935 + ... + 195725954.

It is an arithmetic number, because the mean of its divisors is an integer number (15853761045).

Almost surely, 2^199639953390 is an apocalyptic number.

199639953390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199639953390 is an abundant number, since it is smaller than the sum of its proper divisors (307680400050).

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

199639953390 is a wasteful number, since it uses less digits than its factorization.

199639953390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391450916.

The product of its (nonzero) digits is 47829690, while the sum is 66.

The spelling of 199639953390 in words is "one hundred ninety-nine billion, six hundred thirty-nine million, nine hundred fifty-three thousand, three hundred ninety".