198540379 has 4 divisors (see below), whose sum is σ = 199364440. Its totient is φ = 197716320.

The previous prime is 198540373. The next prime is 198540383. The reversal of 198540379 is 973045891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 198540379 - 2¹¹ = 198538331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198540373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411669 + ... + 412150.

It is an arithmetic number, because the mean of its divisors is an integer number (49841110).

Almost surely, 2^198540379 is an apocalyptic number.

198540379 is a deficient number, since it is larger than the sum of its proper divisors (824061).

198540379 is an equidigital number, since it uses as much as digits as its factorization.

198540379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824060.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 198540379 is about 14090.4357278262. The cubic root of 198540379 is about 583.3774200875.

The spelling of 198540379 in words is "one hundred ninety-eight million, five hundred forty thousand, three hundred seventy-nine".