1905139453 has 6 divisors (see below), whose sum is σ = 2216182686. Its totient is φ = 1632976632.

The previous prime is 1905139451. The next prime is 1905139469. The reversal of 1905139453 is 3549315091.

It can be written as a sum of positive squares in only one way, i.e., 1687812889 + 217326564 = 41083^2 + 14742^2 .

It is not a de Polignac number, because 1905139453 - 2¹ = 1905139451 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 (1905139451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19440150 + ... + 19440247.

It is an arithmetic number, because the mean of its divisors is an integer number (369363781).

Almost surely, 2^1905139453 is an apocalyptic number.

It is an amenable number.

1905139453 is a deficient number, since it is larger than the sum of its proper divisors (311043233).

1905139453 is an equidigital number, since it uses as much as digits as its factorization.

1905139453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38880411 (or 38880404 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 1905139453 is about 43647.9031913333. The cubic root of 1905139453 is about 1239.6780843589.

The spelling of 1905139453 in words is "one billion, nine hundred five million, one hundred thirty-nine thousand, four hundred fifty-three".