257217142 has 64 divisors (see below), whose sum is σ = 507386880. Its totient is φ = 95001984.

The previous prime is 257217101. The next prime is 257217143. The reversal of 257217142 is 241712752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257217143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179284 + ... + 180712.

It is an arithmetic number, because the mean of its divisors is an integer number (7927920).

Almost surely, 2^257217142 is an apocalyptic number.

257217142 is a deficient number, since it is larger than the sum of its proper divisors (250169738).

257217142 is a wasteful number, since it uses less digits than its factorization.

257217142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517.

The product of its digits is 7840, while the sum is 31.

The square root of 257217142 is about 16037.9905848582. The cubic root of 257217142 is about 635.9651283571.

Adding to 257217142 its reverse (241712752), we get a palindrome (498929894).

The spelling of 257217142 in words is "two hundred fifty-seven million, two hundred seventeen thousand, one hundred forty-two".