253343642 has 4 divisors (see below), whose sum is σ = 380015466. Its totient is φ = 126671820.

The previous prime is 253343621. The next prime is 253343647. The reversal of 253343642 is 246343352.

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., 207388801 + 45954841 = 14401^2 + 6779^2 .

It is a junction number, because it is equal to n+sod(n) for n = 253343599 and 253343608.

It is not an unprimeable number, because it can be changed into a prime (253343647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63335909 + ... + 63335912.

Almost surely, 2^253343642 is an apocalyptic number.

253343642 is a deficient number, since it is larger than the sum of its proper divisors (126671824).

253343642 is a wasteful number, since it uses less digits than its factorization.

253343642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126671823.

The product of its digits is 51840, while the sum is 32.

The square root of 253343642 is about 15916.7723486893. The cubic root of 253343642 is about 632.7565797016.

Adding to 253343642 its reverse (246343352), we get a palindrome (499686994).

The spelling of 253343642 in words is "two hundred fifty-three million, three hundred forty-three thousand, six hundred forty-two".