1273563 has 14 divisors (see below), whose sum is σ = 1910564. Its totient is φ = 848556.

The previous prime is 1273561. The next prime is 1273567. The reversal of 1273563 is 3653721.

It is a happy number.

It is not a de Polignac number, because 1273563 - 2¹ = 1273561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273561) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 145 + ... + 1602.

2^1273563 is an apocalyptic number.

1273563 is a deficient number, since it is larger than the sum of its proper divisors (637001).

1273563 is an frugal number, since it uses more digits than its factorization.

1273563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765 (or 1750 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 1273563 is about 1128.5224853763. The cubic root of 1273563 is about 108.3943913530.

The spelling of 1273563 in words is "one million, two hundred seventy-three thousand, five hundred sixty-three".