253887638 has 4 divisors (see below), whose sum is σ = 380831460. Its totient is φ = 126943818.

The previous prime is 253887637. The next prime is 253887677. The reversal of 253887638 is 836788352.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253887637) 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 as a sum of consecutive naturals, namely, 63471908 + ... + 63471911.

It is an arithmetic number, because the mean of its divisors is an integer number (95207865).

Almost surely, 2^253887638 is an apocalyptic number.

253887638 is a deficient number, since it is larger than the sum of its proper divisors (126943822).

253887638 is a wasteful number, since it uses less digits than its factorization.

253887638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126943821.

The product of its digits is 1935360, while the sum is 50.

The square root of 253887638 is about 15933.8519511134. The cubic root of 253887638 is about 633.2091546626.

The spelling of 253887638 in words is "two hundred fifty-three million, eight hundred eighty-seven thousand, six hundred thirty-eight".