7905819457 has 2 divisors, whose sum is σ = 7905819458. Its totient is φ = 7905819456.

The previous prime is 7905819419. The next prime is 7905819479. The reversal of 7905819457 is 7549185097.

It is a happy number.

7905819457 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7716041281 + 189778176 = 87841^2 + 13776^2 .

It is a cyclic number.

It is not a de Polignac number, because 7905819457 - 2⁷ = 7905819329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7905819398 and 7905819407.

It is not a weakly prime, because it can be changed into another prime (7905819557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3952909728 + 3952909729.

It is an arithmetic number, because the mean of its divisors is an integer number (3952909729).

Almost surely, 2^7905819457 is an apocalyptic number.

It is an amenable number.

7905819457 is a deficient number, since it is larger than the sum of its proper divisors (1).

7905819457 is an equidigital number, since it uses as much as digits as its factorization.

7905819457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The square root of 7905819457 is about 88914.6751498311. The cubic root of 7905819457 is about 1992.1206198667.

It can be divided in two parts, 7905819 and 457, that added together give a triangular number (7906276 = T₃₉₇₆).

The spelling of 7905819457 in words is "seven billion, nine hundred five million, eight hundred nineteen thousand, four hundred fifty-seven".