198157790 has 8 divisors (see below), whose sum is σ = 356684040. Its totient is φ = 79263112.

The previous prime is 198157789. The next prime is 198157801. The reversal of 198157790 is 97751891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9907880 + ... + 9907899.

It is an arithmetic number, because the mean of its divisors is an integer number (44585505).

Almost surely, 2^198157790 is an apocalyptic number.

198157790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198157790 is a deficient number, since it is larger than the sum of its proper divisors (158526250).

198157790 is a wasteful number, since it uses less digits than its factorization.

198157790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19815786.

The product of its (nonzero) digits is 158760, while the sum is 47.

The square root of 198157790 is about 14076.8529863745. The cubic root of 198157790 is about 583.0024547126.

The spelling of 198157790 in words is "one hundred ninety-eight million, one hundred fifty-seven thousand, seven hundred ninety".