198001378 has 4 divisors (see below), whose sum is σ = 297002070. Its totient is φ = 99000688.

The previous prime is 198001373. The next prime is 198001381. The reversal of 198001378 is 873100891.

198001378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 138603529 + 59397849 = 11773^2 + 7707^2 .

It is not an unprimeable number, because it can be changed into a prime (198001373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49500343 + ... + 49500346.

Almost surely, 2^198001378 is an apocalyptic number.

198001378 is a deficient number, since it is larger than the sum of its proper divisors (99000692).

198001378 is an equidigital number, since it uses as much as digits as its factorization.

198001378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99000691.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 198001378 is about 14071.2962444830. The cubic root of 198001378 is about 582.8490204501.

The spelling of 198001378 in words is "one hundred ninety-eight million, one thousand, three hundred seventy-eight".