253240402 has 8 divisors (see below), whose sum is σ = 386088012. Its totient is φ = 124544400.

The previous prime is 253240391. The next prime is 253240409. The reversal of 253240402 is 204042352.

It can be written as a sum of positive squares in 2 ways, for example, as 245517561 + 7722841 = 15669^2 + 2779^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (253240409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037749 + ... + 1037992.

Almost surely, 2^253240402 is an apocalyptic number.

253240402 is a deficient number, since it is larger than the sum of its proper divisors (132847610).

253240402 is a wasteful number, since it uses less digits than its factorization.

253240402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075804.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 253240402 is about 15913.5288983933. The cubic root of 253240402 is about 632.6706165352.

Adding to 253240402 its reverse (204042352), we get a palindrome (457282754).

The spelling of 253240402 in words is "two hundred fifty-three million, two hundred forty thousand, four hundred two".