199387440 has 160 divisors (see below), whose sum is σ = 784949760. Its totient is φ = 45570816.

The previous prime is 199387439. The next prime is 199387451. The reversal of 199387440 is 44783991.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8527 + ... + 21713.

It is an arithmetic number, because the mean of its divisors is an integer number (4905936).

Almost surely, 2^199387440 is an apocalyptic number.

199387440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199387440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392474880).

199387440 is an abundant number, since it is smaller than the sum of its proper divisors (585562320).

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

199387440 is a wasteful number, since it uses less digits than its factorization.

199387440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13216 (or 13204 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 199387440 is about 14120.4617488239. The cubic root of 199387440 is about 584.2058916245.

The spelling of 199387440 in words is "one hundred ninety-nine million, three hundred eighty-seven thousand, four hundred forty".