199143864 has 96 divisors (see below), whose sum is σ = 572130000. Its totient is φ = 62401536.

The previous prime is 199143851. The next prime is 199143871. The reversal of 199143864 is 468341991.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 203344 + ... + 204320.

Almost surely, 2^199143864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199143864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286065000).

199143864 is an abundant number, since it is smaller than the sum of its proper divisors (372986136).

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

199143864 is a wasteful number, since it uses less digits than its factorization.

199143864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157 (or 1150 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 199143864 is about 14111.8341826993. The cubic root of 199143864 is about 583.9679018450.

The spelling of 199143864 in words is "one hundred ninety-nine million, one hundred forty-three thousand, eight hundred sixty-four".