199493477 has 4 divisors (see below), whose sum is σ = 201259020. Its totient is φ = 197727936.

The previous prime is 199493473. The next prime is 199493479. The reversal of 199493477 is 774394991.

It is a happy number.

199493477 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: 774394991 = 179 ⋅4326229.

It can be written as a sum of positive squares in 2 ways, for example, as 73290721 + 126202756 = 8561^2 + 11234^2 .

It is a cyclic number.

It is not a de Polignac number, because 199493477 - 2² = 199493473 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 (199493471) 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, 882602 + ... + 882827.

It is an arithmetic number, because the mean of its divisors is an integer number (50314755).

Almost surely, 2^199493477 is an apocalyptic number.

It is an amenable number.

199493477 is a deficient number, since it is larger than the sum of its proper divisors (1765543).

199493477 is a wasteful number, since it uses less digits than its factorization.

199493477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765542.

The product of its digits is 1714608, while the sum is 53.

The square root of 199493477 is about 14124.2159782411. The cubic root of 199493477 is about 584.3094361972.

The spelling of 199493477 in words is "one hundred ninety-nine million, four hundred ninety-three thousand, four hundred seventy-seven".