199740805 has 16 divisors (see below), whose sum is σ = 267562944. Its totient is φ = 141886080.

The previous prime is 199740799. The next prime is 199740817. The reversal of 199740805 is 508047991.

It is not a de Polignac number, because 199740805 - 2⁵ = 199740773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 39864 + ... + 44593.

It is an arithmetic number, because the mean of its divisors is an integer number (16722684).

Almost surely, 2^199740805 is an apocalyptic number.

It is an amenable number.

199740805 is a deficient number, since it is larger than the sum of its proper divisors (67822139).

199740805 is a wasteful number, since it uses less digits than its factorization.

199740805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84516.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 199740805 is about 14132.9687256429. The cubic root of 199740805 is about 584.5508081705.

The spelling of 199740805 in words is "one hundred ninety-nine million, seven hundred forty thousand, eight hundred five".