199748709 has 12 divisors (see below), whose sum is σ = 293256652. Its totient is φ = 130982400.

The previous prime is 199748707. The next prime is 199748711. The reversal of 199748709 is 907847991.

It is an interprime number because it is at equal distance from previous prime (199748707) and next prime (199748711).

It can be written as a sum of positive squares in 2 ways, for example, as 5062500 + 194686209 = 2250^2 + 13953^2 .

It is not a de Polignac number, because 199748709 - 2¹ = 199748707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199748701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181372 + ... + 182469.

Almost surely, 2^199748709 is an apocalyptic number.

It is an amenable number.

199748709 is a deficient number, since it is larger than the sum of its proper divisors (93507943).

199748709 is a wasteful number, since it uses less digits than its factorization.

199748709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363908 (or 363905 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 199748709 is about 14133.2483527319. The cubic root of 199748709 is about 584.5585185441.

The spelling of 199748709 in words is "one hundred ninety-nine million, seven hundred forty-eight thousand, seven hundred nine".