523640493 has 12 divisors (see below), whose sum is σ = 757267420. Its totient is φ = 348679296.

The previous prime is 523640483. The next prime is 523640497. The reversal of 523640493 is 394046325.

523640493 is a `hidden beast` number, since 5 + 2 + 3 + 640 + 4 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 120956004 + 402684489 = 10998^2 + 20067^2 .

It is not a de Polignac number, because 523640493 - 2¹⁰ = 523639469 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 (523640497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26428 + ... + 41781.

Almost surely, 2^523640493 is an apocalyptic number.

It is an amenable number.

523640493 is a deficient number, since it is larger than the sum of its proper divisors (233626927).

523640493 is a wasteful number, since it uses less digits than its factorization.

523640493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69068 (or 69065 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 523640493 is about 22883.1923690730. The cubic root of 523640493 is about 806.0173821799.

The spelling of 523640493 in words is "five hundred twenty-three million, six hundred forty thousand, four hundred ninety-three".