198638427 has 32 divisors (see below), whose sum is σ = 292320000. Its totient is φ = 119233152.

The previous prime is 198638423. The next prime is 198638501. The reversal of 198638427 is 724836891.

It is not a de Polignac number, because 198638427 - 2² = 198638423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198638423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397824 + ... + 398322.

It is an arithmetic number, because the mean of its divisors is an integer number (9135000).

Almost surely, 2^198638427 is an apocalyptic number.

198638427 is a deficient number, since it is larger than the sum of its proper divisors (93681573).

198638427 is a wasteful number, since it uses less digits than its factorization.

198638427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747.

The product of its digits is 580608, while the sum is 48.

The square root of 198638427 is about 14093.9145378422. The cubic root of 198638427 is about 583.4734367875.

The spelling of 198638427 in words is "one hundred ninety-eight million, six hundred thirty-eight thousand, four hundred twenty-seven".