1242455023 has 4 divisors (see below), whose sum is σ = 1243902280. Its totient is φ = 1241007768.

The previous prime is 1242454999. The next prime is 1242455051. The reversal of 1242455023 is 3205542421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1242455023 - 2¹³ = 1242446831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242454982 and 1242455000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242455083) 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, 722340 + ... + 724057.

It is an arithmetic number, because the mean of its divisors is an integer number (310975570).

Almost surely, 2^1242455023 is an apocalyptic number.

1242455023 is a deficient number, since it is larger than the sum of its proper divisors (1447257).

1242455023 is an equidigital number, since it uses as much as digits as its factorization.

1242455023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447256.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 1242455023 is about 35248.4754705789. The cubic root of 1242455023 is about 1075.0456149384.

Adding to 1242455023 its reverse (3205542421), we get a palindrome (4447997444).

The spelling of 1242455023 in words is "one billion, two hundred forty-two million, four hundred fifty-five thousand, twenty-three".