199740039 has 4 divisors (see below), whose sum is σ = 266320056. Its totient is φ = 133160024.

The previous prime is 199740019. The next prime is 199740041. The reversal of 199740039 is 930047991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930047991 = 3 ⋅310015997.

It is a cyclic number.

It is not a de Polignac number, because 199740039 - 2⁵ = 199740007 is a prime.

It is a super-4 number, since 4×199740039⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199740019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33290004 + ... + 33290009.

It is an arithmetic number, because the mean of its divisors is an integer number (66580014).

Almost surely, 2^199740039 is an apocalyptic number.

199740039 is a deficient number, since it is larger than the sum of its proper divisors (66580017).

199740039 is an equidigital number, since it uses as much as digits as its factorization.

199740039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66580016.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 199740039 is about 14132.9416258612. The cubic root of 199740039 is about 584.5500609246.

The spelling of 199740039 in words is "one hundred ninety-nine million, seven hundred forty thousand, thirty-nine".