198400157 has 2 divisors, whose sum is σ = 198400158. Its totient is φ = 198400156.

The previous prime is 198400133. The next prime is 198400159. The reversal of 198400157 is 751004891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196588441 + 1811716 = 14021^2 + 1346^2 .

It is a cyclic number.

It is not a de Polignac number, because 198400157 - 2²² = 194205853 is a prime.

Together with 198400159, 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 (198400159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99200078 + 99200079.

It is an arithmetic number, because the mean of its divisors is an integer number (99200079).

Almost surely, 2^198400157 is an apocalyptic number.

It is an amenable number.

198400157 is a deficient number, since it is larger than the sum of its proper divisors (1).

198400157 is an equidigital number, since it uses as much as digits as its factorization.

198400157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 198400157 is about 14085.4590624516. The cubic root of 198400157 is about 583.2400481758.

The spelling of 198400157 in words is "one hundred ninety-eight million, four hundred thousand, one hundred fifty-seven".