188420417 has 2 divisors, whose sum is σ = 188420418. Its totient is φ = 188420416.

The previous prime is 188420377. The next prime is 188420423. The reversal of 188420417 is 714024881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187251856 + 1168561 = 13684^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 188420417 - 2⁸ = 188420161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188420437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94210208 + 94210209.

It is an arithmetic number, because the mean of its divisors is an integer number (94210209).

Almost surely, 2^188420417 is an apocalyptic number.

It is an amenable number.

188420417 is a deficient number, since it is larger than the sum of its proper divisors (1).

188420417 is an equidigital number, since it uses as much as digits as its factorization.

188420417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 188420417 is about 13726.6316698599. The cubic root of 188420417 is about 573.2921391516.

The spelling of 188420417 in words is "one hundred eighty-eight million, four hundred twenty thousand, four hundred seventeen".