199280405 has 4 divisors (see below), whose sum is σ = 239136492. Its totient is φ = 159424320.

The previous prime is 199280401. The next prime is 199280429. The reversal of 199280405 is 504082991.

199280405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504082991 = 719 ⋅701089.

It can be written as a sum of positive squares in 2 ways, for example, as 45346756 + 153933649 = 6734^2 + 12407^2 .

It is not a de Polignac number, because 199280405 - 2² = 199280401 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 (199280401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19928036 + ... + 19928045.

It is an arithmetic number, because the mean of its divisors is an integer number (59784123).

Almost surely, 2^199280405 is an apocalyptic number.

It is an amenable number.

199280405 is a deficient number, since it is larger than the sum of its proper divisors (39856087).

199280405 is an equidigital number, since it uses as much as digits as its factorization.

199280405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39856086.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 199280405 is about 14116.6711727659. The cubic root of 199280405 is about 584.1013352724.

The spelling of 199280405 in words is "one hundred ninety-nine million, two hundred eighty thousand, four hundred five".