198995405 has 16 divisors (see below), whose sum is σ = 276200064. Its totient is φ = 134808000.

The previous prime is 198995389. The next prime is 198995431. The reversal of 198995405 is 504599891.

It is not a de Polignac number, because 198995405 - 2⁴ = 198995389 is a prime.

It is a super-2 number, since 2×198995405² = 79198342422228050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31346 + ... + 37155.

It is an arithmetic number, because the mean of its divisors is an integer number (17262504).

Almost surely, 2^198995405 is an apocalyptic number.

It is an amenable number.

198995405 is a deficient number, since it is larger than the sum of its proper divisors (77204659).

198995405 is an equidigital number, since it uses as much as digits as its factorization.

198995405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68596.

The product of its (nonzero) digits is 583200, while the sum is 50.

The square root of 198995405 is about 14106.5731132689. The cubic root of 198995405 is about 583.8227524351.

The spelling of 198995405 in words is "one hundred ninety-eight million, nine hundred ninety-five thousand, four hundred five".