199640737 has 2 divisors, whose sum is σ = 199640738. Its totient is φ = 199640736.

The previous prime is 199640731. The next prime is 199640783. The reversal of 199640737 is 737046991.

199640737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (199640783) can be obtained adding 199640737 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197093521 + 2547216 = 14039^2 + 1596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199640737 is a prime.

It is a super-3 number, since 3×199640737³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (199640731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99820368 + 99820369.

It is an arithmetic number, because the mean of its divisors is an integer number (99820369).

Almost surely, 2^199640737 is an apocalyptic number.

It is an amenable number.

199640737 is a deficient number, since it is larger than the sum of its proper divisors (1).

199640737 is an equidigital number, since it uses as much as digits as its factorization.

199640737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 199640737 is about 14129.4280492878. The cubic root of 199640737 is about 584.4531739700.

The spelling of 199640737 in words is "one hundred ninety-nine million, six hundred forty thousand, seven hundred thirty-seven".