1905349247 has 4 divisors (see below), whose sum is σ = 1905840336. Its totient is φ = 1904858160.

The previous prime is 1905349231. The next prime is 1905349267. The reversal of 1905349247 is 7429435091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1905349247 - 2⁴ = 1905349231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1905349198 and 1905349207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1905349207) 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, 239678 + ... + 247499.

It is an arithmetic number, because the mean of its divisors is an integer number (476460084).

Almost surely, 2^1905349247 is an apocalyptic number.

1905349247 is a deficient number, since it is larger than the sum of its proper divisors (491089).

1905349247 is an equidigital number, since it uses as much as digits as its factorization.

1905349247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491088.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 1905349247 is about 43650.3063792226. The cubic root of 1905349247 is about 1239.7235871484.

The spelling of 1905349247 in words is "one billion, nine hundred five million, three hundred forty-nine thousand, two hundred forty-seven".