199800393840 has 60 divisors (see below), whose sum is σ = 670996325064. Its totient is φ = 53280104832.

The previous prime is 199800393839. The next prime is 199800393889. The reversal of 199800393840 is 48393008991.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138749554 + ... + 138750993.

Almost surely, 2^199800393840 is an apocalyptic number.

199800393840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199800393840 is an abundant number, since it is smaller than the sum of its proper divisors (471195931224).

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

199800393840 is a wasteful number, since it uses less digits than its factorization.

199800393840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277500566 (or 277500557 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 199800393840 in words is "one hundred ninety-nine billion, eight hundred million, three hundred ninety-three thousand, eight hundred forty".