253457309 has 8 divisors (see below), whose sum is σ = 302259840. Its totient is φ = 207803376.

The previous prime is 253457299. The next prime is 253457311. The reversal of 253457309 is 903754352.

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 253457309 - 2⁴ = 253457293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253451309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786974 + ... + 787295.

It is an arithmetic number, because the mean of its divisors is an integer number (37782480).

Almost surely, 2^253457309 is an apocalyptic number.

It is an amenable number.

253457309 is a deficient number, since it is larger than the sum of its proper divisors (48802531).

253457309 is a wasteful number, since it uses less digits than its factorization.

253457309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574299.

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 253457309 is about 15920.3426156600. The cubic root of 253457309 is about 632.8511979412.

The spelling of 253457309 in words is "two hundred fifty-three million, four hundred fifty-seven thousand, three hundred nine".