253403242 has 4 divisors (see below), whose sum is σ = 380104866. Its totient is φ = 126701620.

The previous prime is 253403237. The next prime is 253403261. The reversal of 253403242 is 242304352.

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

It can be written as a sum of positive squares in only one way, i.e., 154778481 + 98624761 = 12441^2 + 9931^2 .

It is a super-2 number, since 2×253403242² = 128426406112221128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63350809 + ... + 63350812.

Almost surely, 2^253403242 is an apocalyptic number.

253403242 is a deficient number, since it is larger than the sum of its proper divisors (126701624).

253403242 is a wasteful number, since it uses less digits than its factorization.

253403242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126701623.

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 253403242 is about 15918.6444774673. The cubic root of 253403242 is about 632.8061952290.

Adding to 253403242 its reverse (242304352), we get a palindrome (495707594).

It can be divided in two parts, 25340 and 3242, that added together give a palindrome (28582).

The spelling of 253403242 in words is "two hundred fifty-three million, four hundred three thousand, two hundred forty-two".