190687397 has 2 divisors, whose sum is σ = 190687398. Its totient is φ = 190687396.

The previous prime is 190687391. The next prime is 190687421. The reversal of 190687397 is 793786091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172291876 + 18395521 = 13126^2 + 4289^2 .

It is a cyclic number.

It is not a de Polignac number, because 190687397 - 2⁸ = 190687141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190687391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95343698 + 95343699.

It is an arithmetic number, because the mean of its divisors is an integer number (95343699).

Almost surely, 2^190687397 is an apocalyptic number.

It is an amenable number.

190687397 is a deficient number, since it is larger than the sum of its proper divisors (1).

190687397 is an equidigital number, since it uses as much as digits as its factorization.

190687397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 190687397 is about 13808.9607501796. The cubic root of 190687397 is about 575.5821672770.

The spelling of 190687397 in words is "one hundred ninety million, six hundred eighty-seven thousand, three hundred ninety-seven".