199993428 has 48 divisors (see below), whose sum is σ = 525624960. Its totient is φ = 65748672.

The previous prime is 199993427. The next prime is 199993447. The reversal of 199993428 is 824399991.

199993428 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

199993428 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199993427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4800 + ... + 20567.

It is an arithmetic number, because the mean of its divisors is an integer number (10950520).

Almost surely, 2^199993428 is an apocalyptic number.

199993428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

199993428 is an abundant number, since it is smaller than the sum of its proper divisors (325631532).

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

199993428 is a wasteful number, since it uses less digits than its factorization.

199993428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25453 (or 25445 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 199993428 is about 14141.9032665338. The cubic root of 199993428 is about 584.7971420242.

The spelling of 199993428 in words is "one hundred ninety-nine million, nine hundred ninety-three thousand, four hundred twenty-eight".