1205640463 has 2 divisors, whose sum is σ = 1205640464. Its totient is φ = 1205640462.

The previous prime is 1205640419. The next prime is 1205640467. The reversal of 1205640463 is 3640465021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1205640463 - 2²⁵ = 1172086031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205640467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602820231 + 602820232.

It is an arithmetic number, because the mean of its divisors is an integer number (602820232).

Almost surely, 2^1205640463 is an apocalyptic number.

1205640463 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205640463 is an equidigital number, since it uses as much as digits as its factorization.

1205640463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1205640463 is about 34722.3337781319. Note that the first 3 decimals coincide. The cubic root of 1205640463 is about 1064.3209357368.

The spelling of 1205640463 in words is "one billion, two hundred five million, six hundred forty thousand, four hundred sixty-three".