1245663 has 6 divisors (see below), whose sum is σ = 1799304. Its totient is φ = 830436.

The previous prime is 1245649. The next prime is 1245683. The reversal of 1245663 is 3665421.

It is not a de Polignac number, because 1245663 - 2¹³ = 1237471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69195 + ... + 69212.

It is an arithmetic number, because the mean of its divisors is an integer number (299884).

2^1245663 is an apocalyptic number.

1245663 is a deficient number, since it is larger than the sum of its proper divisors (553641).

1245663 is a wasteful number, since it uses less digits than its factorization.

1245663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138413 (or 138410 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1245663 is about 1116.0927380823. The cubic root of 1245663 is about 107.5970063613.

The spelling of 1245663 in words is "one million, two hundred forty-five thousand, six hundred sixty-three".