199967640 has 32 divisors (see below), whose sum is σ = 599903280. Its totient is φ = 53324672.

The previous prime is 199967633. The next prime is 199967671. The reversal of 199967640 is 46769991.

199967640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 833079 + ... + 833318.

Almost surely, 2^199967640 is an apocalyptic number.

199967640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199967640 is an abundant number, since it is smaller than the sum of its proper divisors (399935640).

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

199967640 is a wasteful number, since it uses less digits than its factorization.

199967640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666411 (or 1666407 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 199967640 is about 14140.9914786765. The cubic root of 199967640 is about 584.7720055367.

The spelling of 199967640 in words is "one hundred ninety-nine million, nine hundred sixty-seven thousand, six hundred forty".