257953447 has 4 divisors (see below), whose sum is σ = 257990040. Its totient is φ = 257916856.

The previous prime is 257953433. The next prime is 257953469. The reversal of 257953447 is 744359752.

257953447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257953447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257953397 and 257953406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257953477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3997 + ... + 23062.

It is an arithmetic number, because the mean of its divisors is an integer number (64497510).

Almost surely, 2^257953447 is an apocalyptic number.

257953447 is a deficient number, since it is larger than the sum of its proper divisors (36593).

257953447 is an equidigital number, since it uses as much as digits as its factorization.

257953447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36592.

The product of its digits is 1058400, while the sum is 46.

The square root of 257953447 is about 16060.9292072408. The cubic root of 257953447 is about 636.5713842162.

The spelling of 257953447 in words is "two hundred fifty-seven million, nine hundred fifty-three thousand, four hundred forty-seven".