427217257 has 4 divisors (see below), whose sum is σ = 428034640. Its totient is φ = 426399876.

The previous prime is 427217251. The next prime is 427217267. The reversal of 427217257 is 752712724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 427217257 - 2⁷ = 427217129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427217251) 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, 407907 + ... + 408952.

It is an arithmetic number, because the mean of its divisors is an integer number (107008660).

Almost surely, 2^427217257 is an apocalyptic number.

It is an amenable number.

427217257 is a deficient number, since it is larger than the sum of its proper divisors (817383).

427217257 is an equidigital number, since it uses as much as digits as its factorization.

427217257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817382.

The product of its digits is 54880, while the sum is 37.

The square root of 427217257 is about 20669.2345528324. The cubic root of 427217257 is about 753.1525122483.

The spelling of 427217257 in words is "four hundred twenty-seven million, two hundred seventeen thousand, two hundred fifty-seven".