253936138 has 4 divisors (see below), whose sum is σ = 380904210. Its totient is φ = 126968068.

The previous prime is 253936127. The next prime is 253936141. The reversal of 253936138 is 831639352.

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., 212372329 + 41563809 = 14573^2 + 6447^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 253936138.

It is an unprimeable number.

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, 63484033 + ... + 63484036.

Almost surely, 2^253936138 is an apocalyptic number.

253936138 is a deficient number, since it is larger than the sum of its proper divisors (126968072).

253936138 is a wasteful number, since it uses less digits than its factorization.

253936138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126968071.

The product of its digits is 116640, while the sum is 40.

The square root of 253936138 is about 15935.3737954276. The cubic root of 253936138 is about 633.2494726144.

The spelling of 253936138 in words is "two hundred fifty-three million, nine hundred thirty-six thousand, one hundred thirty-eight".