1905649793 has 2 divisors, whose sum is σ = 1905649794. Its totient is φ = 1905649792.

The previous prime is 1905649729. The next prime is 1905649817. The reversal of 1905649793 is 3979465091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1855197184 + 50452609 = 43072^2 + 7103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1905649793 - 2⁶ = 1905649729 is a prime.

It is a super-2 number, since 2×1905649793² = 7263002267121885698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1905649723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952824896 + 952824897.

It is an arithmetic number, because the mean of its divisors is an integer number (952824897).

Almost surely, 2^1905649793 is an apocalyptic number.

It is an amenable number.

1905649793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1905649793 is an equidigital number, since it uses as much as digits as its factorization.

1905649793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The square root of 1905649793 is about 43653.7488997222. The cubic root of 1905649793 is about 1239.7887675655.

The spelling of 1905649793 in words is "one billion, nine hundred five million, six hundred forty-nine thousand, seven hundred ninety-three".