257261738 has 16 divisors (see below), whose sum is σ = 394796160. Its totient is φ = 125672736.

The previous prime is 257261723. The next prime is 257261749. The reversal of 257261738 is 837162752.

It is a junction number, because it is equal to n+sod(n) for n = 257261695 and 257261704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59870 + ... + 64022.

It is an arithmetic number, because the mean of its divisors is an integer number (24674760).

Almost surely, 2^257261738 is an apocalyptic number.

257261738 is a deficient number, since it is larger than the sum of its proper divisors (137534422).

257261738 is a wasteful number, since it uses less digits than its factorization.

257261738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861.

The product of its digits is 141120, while the sum is 41.

The square root of 257261738 is about 16039.3808483994. The cubic root of 257261738 is about 636.0018805240.

The spelling of 257261738 in words is "two hundred fifty-seven million, two hundred sixty-one thousand, seven hundred thirty-eight".