214640257 has 8 divisors (see below), whose sum is σ = 232537536. Its totient is φ = 196941072.

The previous prime is 214640213. The next prime is 214640303. The reversal of 214640257 is 752046412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214640257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (214640057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47263 + ... + 51604.

It is an arithmetic number, because the mean of its divisors is an integer number (29067192).

Almost surely, 2^214640257 is an apocalyptic number.

It is an amenable number.

214640257 is a deficient number, since it is larger than the sum of its proper divisors (17897279).

214640257 is a wasteful number, since it uses less digits than its factorization.

214640257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99047.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 214640257 is about 14650.6060284208. The cubic root of 214640257 is about 598.7383275343.

Adding to 214640257 its reverse (752046412), we get a palindrome (966686669).

The spelling of 214640257 in words is "two hundred fourteen million, six hundred forty thousand, two hundred fifty-seven".