257240222 has 8 divisors (see below), whose sum is σ = 386967000. Its totient is φ = 128251224.

The previous prime is 257240219. The next prime is 257240227. The reversal of 257240222 is 222042752.

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

It is a junction number, because it is equal to n+sod(n) for n = 257240191 and 257240200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257240227) 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, 183572 + ... + 184967.

It is an arithmetic number, because the mean of its divisors is an integer number (48370875).

Almost surely, 2^257240222 is an apocalyptic number.

257240222 is a deficient number, since it is larger than the sum of its proper divisors (129726778).

257240222 is a wasteful number, since it uses less digits than its factorization.

257240222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368890.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 257240222 is about 16038.7101102302. The cubic root of 257240222 is about 635.9841494276.

Adding to 257240222 its reverse (222042752), we get a palindrome (479282974).

The spelling of 257240222 in words is "two hundred fifty-seven million, two hundred forty thousand, two hundred twenty-two".