199191648 has 24 divisors (see below), whose sum is σ = 522878328. Its totient is φ = 66397184.

The previous prime is 199191623. The next prime is 199191673. The reversal of 199191648 is 846191991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (199191623) and next prime (199191673).

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 199191597 and 199191606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037361 + ... + 1037552.

It is an arithmetic number, because the mean of its divisors is an integer number (21786597).

Almost surely, 2^199191648 is an apocalyptic number.

It is an amenable number.

199191648 is an abundant number, since it is smaller than the sum of its proper divisors (323686680).

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

199191648 is a wasteful number, since it uses less digits than its factorization.

199191648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074926 (or 2074918 counting only the distinct ones).

The product of its digits is 139968, while the sum is 48.

The square root of 199191648 is about 14113.5271282554. The cubic root of 199191648 is about 584.0146052518.

It can be divided in two parts, 1991 and 91648, that added together give a palindrome (93639).

The spelling of 199191648 in words is "one hundred ninety-nine million, one hundred ninety-one thousand, six hundred forty-eight".