257235387 has 8 divisors (see below), whose sum is σ = 343262736. Its totient is φ = 171349152.

The previous prime is 257235379. The next prime is 257235389. The reversal of 257235387 is 783532752.

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

It is not a de Polignac number, because 257235387 - 2³ = 257235379 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (257235389) 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, 30948 + ... + 38369.

It is an arithmetic number, because the mean of its divisors is an integer number (42907842).

Almost surely, 2^257235387 is an apocalyptic number.

257235387 is a deficient number, since it is larger than the sum of its proper divisors (86027349).

257235387 is a wasteful number, since it uses less digits than its factorization.

257235387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70557.

The product of its digits is 352800, while the sum is 42.

The square root of 257235387 is about 16038.5593804431. The cubic root of 257235387 is about 635.9801648218.

The spelling of 257235387 in words is "two hundred fifty-seven million, two hundred thirty-five thousand, three hundred eighty-seven".