1253603 has 4 divisors (see below), whose sum is σ = 1350048. Its totient is φ = 1157160.

The previous prime is 1253599. The next prime is 1253621. The reversal of 1253603 is 3063521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3063521 = 1153 ⋅2657.

It is a cyclic number.

It is not a de Polignac number, because 1253603 - 2² = 1253599 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 (1253683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48203 + ... + 48228.

It is an arithmetic number, because the mean of its divisors is an integer number (337512).

2^1253603 is an apocalyptic number.

1253603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1253603 is a deficient number, since it is larger than the sum of its proper divisors (96445).

1253603 is an equidigital number, since it uses as much as digits as its factorization.

1253603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96444.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 1253603 is about 1119.6441398945. The cubic root of 1253603 is about 107.8251342612.

The spelling of 1253603 in words is "one million, two hundred fifty-three thousand, six hundred three".