1242404253 has 12 divisors (see below), whose sum is σ = 1795552668. Its totient is φ = 827822400.

The previous prime is 1242404237. The next prime is 1242404257. The reversal of 1242404253 is 3524042421.

1242404253 is a `hidden beast` number, since 1 + 2 + 4 + 2 + 404 + 253 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 728838009 + 513566244 = 26997^2 + 22662^2 .

It is not a de Polignac number, because 1242404253 - 2⁴ = 1242404237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242404257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19200 + ... + 53417.

It is an arithmetic number, because the mean of its divisors is an integer number (149629389).

Almost surely, 2^1242404253 is an apocalyptic number.

It is an amenable number.

1242404253 is a deficient number, since it is larger than the sum of its proper divisors (553148415).

1242404253 is a wasteful number, since it uses less digits than its factorization.

1242404253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74524 (or 74521 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 1242404253 is about 35247.7552902309. The cubic root of 1242404253 is about 1075.0309716694.

Adding to 1242404253 its reverse (3524042421), we get a palindrome (4766446674).

The spelling of 1242404253 in words is "one billion, two hundred forty-two million, four hundred four thousand, two hundred fifty-three".