1908393853 has 2 divisors, whose sum is σ = 1908393854. Its totient is φ = 1908393852.

The previous prime is 1908393847. The next prime is 1908393857. The reversal of 1908393853 is 3583938091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1364711364 + 543682489 = 36942^2 + 23317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1908393853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1908393797 and 1908393806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1908393857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954196926 + 954196927.

It is an arithmetic number, because the mean of its divisors is an integer number (954196927).

Almost surely, 2^1908393853 is an apocalyptic number.

It is an amenable number.

1908393853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1908393853 is an equidigital number, since it uses as much as digits as its factorization.

1908393853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 1908393853 is about 43685.1674255691. The cubic root of 1908393853 is about 1240.3835643538.

The spelling of 1908393853 in words is "one billion, nine hundred eight million, three hundred ninety-three thousand, eight hundred fifty-three".