1263506 has 4 divisors (see below), whose sum is σ = 1895262. Its totient is φ = 631752.

The previous prime is 1263503. The next prime is 1263511. The reversal of 1263506 is 6053621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6053621 = 7 ⋅864803.

It can be written as a sum of positive squares in only one way, i.e., 737881 + 525625 = 859^2 + 725^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1263503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315875 + ... + 315878.

2^1263506 is an apocalyptic number.

1263506 is a deficient number, since it is larger than the sum of its proper divisors (631756).

1263506 is an equidigital number, since it uses as much as digits as its factorization.

1263506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631755.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1263506 is about 1124.0578276939. The cubic root of 1263506 is about 108.1083161133.

The spelling of 1263506 in words is "one million, two hundred sixty-three thousand, five hundred six".