1242653 has 4 divisors (see below), whose sum is σ = 1247328. Its totient is φ = 1237980.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242653 is 3562421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3562421 = 43 ⋅82847.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242653 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 2¹⁰ + 4³ + 2²⁰ + 6³ + 5⁶ + 3¹¹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242623) 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, 1913 + ... + 2478.

It is an arithmetic number, because the mean of its divisors is an integer number (311832).

2^1242653 is an apocalyptic number.

It is an amenable number.

1242653 is a deficient number, since it is larger than the sum of its proper divisors (4675).

1242653 is an equidigital number, since it uses as much as digits as its factorization.

1242653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4674.

The product of its digits is 1440, while the sum is 23.

The square root of 1242653 is about 1114.7434682473. The cubic root of 1242653 is about 107.5102712378.

Adding to 1242653 its sum of digits (23), we get a triangular number (1242676 = T₁₅₇₆).

The spelling of 1242653 in words is "one million, two hundred forty-two thousand, six hundred fifty-three".