199157640 has 192 divisors, whose sum is σ = 677782080. Its totient is φ = 46425600.

The previous prime is 199157617. The next prime is 199157663. The reversal of 199157640 is 46751991.

It is an interprime number because it is at equal distance from previous prime (199157617) and next prime (199157663).

It is a junction number, because it is equal to n+sod(n) for n = 199157592 and 199157601.

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 47 ways as a sum of consecutive naturals, for example, 1268442 + ... + 1268598.

It is an arithmetic number, because the mean of its divisors is an integer number (3530115).

Almost surely, 2^199157640 is an apocalyptic number.

199157640 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 199157640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338891040).

199157640 is an abundant number, since it is smaller than the sum of its proper divisors (478624440).

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

199157640 is a wasteful number, since it uses less digits than its factorization.

199157640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 199157640 is about 14112.3222752317. The cubic root of 199157640 is about 583.9813670792.

The spelling of 199157640 in words is "one hundred ninety-nine million, one hundred fifty-seven thousand, six hundred forty".