188899397 has 2 divisors, whose sum is σ = 188899398. Its totient is φ = 188899396.

The previous prime is 188899363. The next prime is 188899411. The reversal of 188899397 is 793998881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110859841 + 78039556 = 10529^2 + 8834^2 .

It is a cyclic number.

It is not a de Polignac number, because 188899397 - 2⁸ = 188899141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188899327) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94449698 + 94449699.

It is an arithmetic number, because the mean of its divisors is an integer number (94449699).

Almost surely, 2^188899397 is an apocalyptic number.

It is an amenable number.

188899397 is a deficient number, since it is larger than the sum of its proper divisors (1).

188899397 is an equidigital number, since it uses as much as digits as its factorization.

188899397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 62.

The square root of 188899397 is about 13744.0677021033. The cubic root of 188899397 is about 573.7775131535. Note that the first 3 decimals are identical.

The spelling of 188899397 in words is "one hundred eighty-eight million, eight hundred ninety-nine thousand, three hundred ninety-seven".