253438905 has 8 divisors (see below), whose sum is σ = 405502272. Its totient is φ = 135167408.

The previous prime is 253438901. The next prime is 253438931. The reversal of 253438905 is 509834352.

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

It is a cyclic number.

It is not a de Polignac number, because 253438905 - 2² = 253438901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253438901) 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 in 7 ways as a sum of consecutive naturals, for example, 8447949 + ... + 8447978.

It is an arithmetic number, because the mean of its divisors is an integer number (50687784).

Almost surely, 2^253438905 is an apocalyptic number.

It is an amenable number.

253438905 is a deficient number, since it is larger than the sum of its proper divisors (152063367).

253438905 is a wasteful number, since it uses less digits than its factorization.

253438905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16895935.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 253438905 is about 15919.7646025310. The cubic root of 253438905 is about 632.8358800751.

The spelling of 253438905 in words is "two hundred fifty-three million, four hundred thirty-eight thousand, nine hundred five".