1245205530 has 48 divisors (see below), whose sum is σ = 3281901480. Its totient is φ = 327504384.

The previous prime is 1245205529. The next prime is 1245205537. The reversal of 1245205530 is 355025421.

It is a happy number.

1245205530 is a `hidden beast` number, since 124 + 5 + 2 + 0 + 5 + 530 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 783944001 + 461261529 = 27999^2 + 21477^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1245205494 and 1245205503.

It is not an unprimeable number, because it can be changed into a prime (1245205537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88195 + ... + 101334.

Almost surely, 2^1245205530 is an apocalyptic number.

1245205530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1245205530 is an abundant number, since it is smaller than the sum of its proper divisors (2036695950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1245205530 is a wasteful number, since it uses less digits than its factorization.

1245205530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189615 (or 189612 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 1245205530 is about 35287.4698724632. The cubic root of 1245205530 is about 1075.8383307405.

The spelling of 1245205530 in words is "one billion, two hundred forty-five million, two hundred five thousand, five hundred thirty".