198156027 has 4 divisors (see below), whose sum is σ = 264208040. Its totient is φ = 132104016.

The previous prime is 198156011. The next prime is 198156031. The reversal of 198156027 is 720651891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 720651891 = 3 ⋅240217297.

It is not a de Polignac number, because 198156027 - 2⁴ = 198156011 is a prime.

It is a super-2 number, since 2×198156027² = 78531622072849458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198156047) 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, 33026002 + ... + 33026007.

It is an arithmetic number, because the mean of its divisors is an integer number (66052010).

Almost surely, 2^198156027 is an apocalyptic number.

198156027 is a deficient number, since it is larger than the sum of its proper divisors (66052013).

198156027 is an equidigital number, since it uses as much as digits as its factorization.

198156027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66052012.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 198156027 is about 14076.7903657048. The cubic root of 198156027 is about 583.0007257262. Note that the first 3 decimals are identical.

The spelling of 198156027 in words is "one hundred ninety-eight million, one hundred fifty-six thousand, twenty-seven".