198636407 has 2 divisors, whose sum is σ = 198636408. Its totient is φ = 198636406.

The previous prime is 198636401. The next prime is 198636409. The reversal of 198636407 is 704636891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198636407 - 2⁴ = 198636391 is a prime.

Together with 198636409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198636401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99318203 + 99318204.

It is an arithmetic number, because the mean of its divisors is an integer number (99318204).

Almost surely, 2^198636407 is an apocalyptic number.

198636407 is a deficient number, since it is larger than the sum of its proper divisors (1).

198636407 is an equidigital number, since it uses as much as digits as its factorization.

198636407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 198636407 is about 14093.8428755255. The cubic root of 198636407 is about 583.4714589555.

The spelling of 198636407 in words is "one hundred ninety-eight million, six hundred thirty-six thousand, four hundred seven".